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Short answer: choose the BMW E38 when steering response, body control and a driver-focused balance matter most; choose the Mercedes-Benz W140 when quiet cruising, rear-seat space and a softer ride are the priority. Neither is inherently the reliable or cheaper car. A sound six-cylinder or V8 with records can be a better purchase than a neglected V12, regardless of badge. Compare the exact year, engine, transmission, suspension specification and maintenance history before comparing the generations.
What the E38 and W140 actually are
These cars overlap in size and price as used classics, but they were engineered around different ideas of luxury. Mercedes-Benz identifies the W140 S-Class as a 1991–1998 generation. BMW Group Classic dates E38 7 Series production from April 1994 to July 2001 and records 327,598 cars built, including standard- and long-wheelbase sedans and the L7 limousine.
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The overlap is therefore incomplete: early W140s pre-date the E38, while the BMW continued after the Mercedes generation ended. Equipment, engines and transmissions changed during both production runs, so “E38 versus W140” is not one fixed specification comparison. A 1994 six-cylinder W140 and a late 750iL answer different questions from a 1999 740i and an early S500.
Range and body choices
| Model family | Production context | Engine range documented in the supplied sources | Body choices |
|---|---|---|---|
| BMW E38 7 Series | April 1994–July 2001; 327,598 produced | Six-cylinder petrol, V8, V12 and diesel variants. BMW’s 740i history cites 3,982 cc, later enlarged to 4,398 cc, with 286 bhp; the 750i history cites a 5,379 cc V12 producing 326 bhp. | Standard wheelbase, long wheelbase and L7 limousine. |
| Mercedes-Benz W140 S-Class | 1991–1998 | Six-cylinder, V8 and V12 sedans are covered by the Mercedes-Benz Club of America buyer guide. | Standard and long-wheelbase sedans, with market and trim differences. |
The BMW figures are factory-history specifications, not a complete list of every market or model year. The Mercedes engine range likewise varies by market and year. Always decode the vehicle identification number and verify the engine code before ordering parts or estimating service.
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BMW E38 vs Mercedes W140 engine and transmission character
Engine choice has more influence on the driving experience than the badge. Weight, gearing, final-drive ratio, emissions equipment and transmission calibration changed over the production runs. A like-for-like comparison should use cars with similar displacement and condition.
BMW E38 six-cylinder and V8 models
The E38 line included six-cylinder petrol engines, V8s, a V12 and diesels. BMW Group Classic lists the 740i with a 3,982 cc V8 that was later enlarged to 4,398 cc, rated at 286 bhp in the cited history. That gives the 740i a useful middle ground: substantially more effortless torque than the smaller six-cylinder cars without the mechanical and servicing complexity of the V12.
BMW’s 750i history records a 5,379 cc V12 producing 326 bhp. That specification establishes displacement and output; it does not, by itself, prove that every 750i is quicker than every W140. A worn transmission, restricted intake, cooling problem or low-compression engine can erase the advantage of a healthy factory specification.
Mercedes-Benz W140 six-cylinder, V8 and V12 models
The W140 buyer guide covers six-cylinder, V8 and V12 sedans. In the owner comparison reported by Jarryd Neves in 2026, a 3.2-litre S320 felt smooth but less forceful than his 4.4-litre BMW 740i. He also found the Mercedes four-speed automatic slower to respond than the BMW five-speed automatic in those particular cars.
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That observation should not be generalized to every W140. The same account says a 5.0-litre S500 better suits the W140’s relaxed character, delivering the effortless power expected from the large Mercedes. A V8 W140 is a materially different proposition from an S320, while a V12 introduces another level of heat, packaging and service exposure.
What the available comparison does—and does not—prove
Neves described stronger low-speed pull and a more responsive automatic in his 4.4-litre 740i than in his S320, and he preferred the BMW on winding roads. Those are first-person impressions from two individual cars, not instrumented acceleration, braking or transmission tests. They are useful for understanding the character of the pairing, not for assigning a universal performance ranking.
| Question | Most defensible answer from the available evidence | Qualification |
|---|---|---|
| Which feels stronger than an S320 in the cited pairing? | The 4.4-litre 740i. | One owner’s comparison of specific cars; not a population-wide result. |
| Which W140 engine better matches the chassis’s relaxed personality? | The author considered the 5.0-litre S500 a better fit than the S320. | Personal judgment, not a standardized test. |
| Does the E38 750i automatically outperform every W140? | Not established. | BMW’s 326-bhp factory figure is documented, but no controlled BMW-versus-Mercedes acceleration comparison is supplied. |
Ride comfort, isolation and handling
The clearest separation is ride and road feel. The W140 was designed to make distance disappear: heavy sound insulation, a substantial body and suspension tuning that prioritizes composure over feedback. The E38 is comfortable, but its controls and body motions feel more connected to the road.
When the W140 is the better tool
On broken pavement, the owner comparison found the W140 notably more forgiving. It isolated occupants from tire noise, impacts and surface disturbance more completely than the 740i. For motorway travel, chauffeur duty or a passenger who values a calm rear cabin, that cushion can outweigh the Mercedes’s slower-feeling responses.
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Neves summarized his own long-distance impression this way: “For long journeys, poor surfaces, or simply travelling in a greater degree of refinement, the W140 was in another league.” That is a personal conclusion about the cars he drove, not a laboratory finding. Wheel diameter, tire sidewall, damper condition, worn suspension bushings and optional equipment can change the result dramatically.
When the E38 is the better tool
The E38’s firmer control and more immediate steering make it easier to place on a winding road. The cited owner preferred it when the route, rather than the destination, was the point. That does not make the BMW harsh: a correctly maintained standard-wheel car remains a capable long-distance sedan. It simply communicates more of the road than the W140.
| Priority | Likely better fit | Why |
|---|---|---|
| Broken urban pavement and maximum isolation | W140 | Softer, more forgiving ride and stronger suppression of road disturbance in the cited comparison. |
| Winding roads and steering involvement | E38 | More composed and engaging feel reported in the 740i-versus-S320 pairing. |
| High-speed refinement | Condition-dependent, with a W140 bias | The W140’s insulation is a defining strength, but tires, seals and suspension condition can reverse the experience. |
Rear-cabin space and everyday usability
Both cars were sold as executive sedans, and both can be found in long-wheelbase form. The W140’s physical presence and isolation make it especially persuasive as a rear-seat car. The E38 long-wheelbase versions also provide meaningful additional legroom, while the L7 limousine occupies a separate, rarer category.
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BMW E38 vs Mercedes W140 reliability: what can be established
There is no cited fleet-level dataset that fairly ranks all E38 and W140 variants. It is therefore not accurate to say that one generation is simply “more reliable.” Reliability in a 25- to 35-year-old luxury car is primarily a function of engine choice, previous repairs, corrosion, storage, electrical condition, parts availability and the quality of current maintenance.
W140 inspection items identified by the Mercedes-Benz Club of America guide
- Early biodegradable wiring harnesses: inspect insulation condition and confirm whether the relevant harness has been replaced or repaired correctly.
- Air-conditioning evaporator: the guide warns of possible leaks, particularly on cars built before 1996. Confirm cooling performance and look for evidence of major dashboard-out work.
- PSE pneumatic-system pump: test the central locking and related pneumatic functions rather than assuming they work because the car starts.
- Fluid-filled motor mounts: inspect for leakage, sagging or excessive vibration at idle and under load.
- Rear window regulators: operate every window repeatedly and listen for slow movement, slipping cables or grinding.
- Power-steering leaks: inspect the pump, hoses, reservoir and steering gear for wetness and verify assist at parking speeds.
- V12 servicing: the guide states that V12 maintenance costs substantially more than six- and eight-cylinder models.
- Service records: the guide stresses documented history. Invoices are more useful than a seller’s verbal assurance.
These are inspection leads, not failure-rate statistics. They should prompt testing and price estimates, not an assumption that every W140 has each defect.
E38 inspection priorities
The supplied material does not establish a single E38 failure list or comparative failure rate. Use the same disciplined approach: identify the exact engine and transmission, inspect cooling and electrical systems, scan applicable control modules, check suspension and steering wear, verify climate-control operation and examine the underside for leaks or corrosion. A specialist who knows the specific engine family can distinguish routine age-related work from a major impending repair.
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BMW E38 vs Mercedes W140 running costs
There is no standardized total-cost comparison in the available evidence, and market prices or repair estimates are not comparable without a country, currency, condition and labour rate. Purchase price is only one line in the budget. Add inspection, transport, registration, insurance, tires, fluids, scheduled service, deferred maintenance and a reserve for electrical, climate-control, suspension and transmission work.
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Fuel consumption: use the number correctly
In his personal account, Neves reported approximately 10.8 mpg for his S320 and 13.8 mpg for his 740i. These are one owner’s averages, not a controlled test and not representative estimates for all W140 or E38 cars. The figures also do not state a repeatable route, weather, traffic mix, tire pressure, fuel standard or whether the mpg convention is US or imperial. Use them only as an illustration that a particular car’s result can differ from expectations.
For a purchase decision, measure fuel use consistently after the inspection: fill the same way, record odometer distance, repeat over several tanks and identify the mpg convention. Compare cars driven on the same route and by the same driver where possible. A rich-running engine, slipping transmission, dragging brake or underinflated tire can dominate the result.
How engine choice changes the repair budget
| Configuration | Budget implication | What to verify |
|---|---|---|
| Six-cylinder | Usually the simplest entry point within each range, but age-related systems still matter. | Cooling, oil leaks, transmission service, wiring and climate operation. |
| V8 | More power and often a good character match, with greater parts and labor exposure than a six-cylinder. | Cooling capacity, mounts, transmission behavior and evidence of deferred service. |
| V12 | Highest complexity; the Mercedes-Benz Club of America guide specifically warns that servicing costs substantially more than six- and eight-cylinder models. | Complete records, specialist inspection, diagnostic scan and a realistic reserve for duplicate-bank components. |
| Diesel E38 | Fuel and maintenance considerations depend on the market and engine; no universal cost conclusion is supported here. | Engine code, emissions requirements, injection system condition and local parts access. |
A purchase inspection process that works for either car
- Define the exact target. Write down model year, wheelbase, engine, transmission, options and intended use. Do not compare an S320 with a 750i and call the result a generation verdict.
- Request records before traveling. Ask for repair invoices, inspection reports, transmission service evidence, cooling-system work and proof of major electrical or climate repairs. Treat missing records as uncertainty that must be reflected in the budget.
- Confirm identity and specification. Check the VIN, engine code, build date, wheelbase and market equipment against the seller’s description. This prevents ordering the wrong parts and exposes undocumented swaps.
- Inspect the body and underside in daylight. Look for corrosion, previous accident repairs, fluid trails, damaged jacking points, uneven tire wear and signs that leaks have been cleaned immediately before sale.
- Test every electrical and comfort function. Operate windows, locks, seats, mirrors, sunroof, climate controls, audio, warning lamps and instrument displays. Intermittent faults are still faults.
- Scan applicable systems. Use equipment that can communicate with the car’s relevant engine, transmission, restraint, climate and body modules. Record codes before clearing anything.
- Evaluate cold and hot operation. Start the car cold, observe idle quality and warning lights, then repeat checks after a full warm-up. Verify cooling-fan behavior, temperature stability, transmission shifts and hot restart.
- Drive varied roads. Include low-speed steering, rough pavement, braking, motorway speed and a winding section. Listen for suspension knocks, driveline vibration, tire roar and wind noise.
- Obtain specialist estimates. Give the inspection findings to a technician familiar with that exact engine and year. Request separate estimates for urgent safety work, reliability work and cosmetic work.
- Price local parts and labor before negotiating. Availability differs by country and by engine. A cheap purchase can become expensive if a specialist, diagnostic tool or uncommon component is far away.
Decision guide: which one should you buy?
Choose an E38 when
- You want a more involving steering and chassis response than the W140 delivered in the cited comparison.
- You regularly drive winding roads and value body control over maximum isolation.
- You have found a documented six-cylinder or V8 with a specialist inspection and accessible parts support.
- You prefer the BMW’s cabin proportions, controls or long-wheelbase options and accept that condition matters more than the model name.
Choose a W140 when
- Your priorities are a soft ride, low noise and a relaxed long-distance experience.
- Rear-seat comfort and physical cabin isolation matter more than quick transmission response.
- You can verify wiring, climate, pneumatic, window-regulator, motor-mount and steering-system condition.
- You are prepared for the substantially higher service exposure of a V12 rather than assuming the badge guarantees effortless ownership.
Walk away from either car when
- The seller refuses an independent inspection or will not provide a cold start.
- Warning lights are hidden, diagnostic access is blocked or the underside is freshly washed to conceal leaks.
- The price only works if no repairs are needed. A decades-old luxury sedan should be budgeted with a reserve.
- The engine, transmission or wheelbase cannot be verified from the VIN and documentation.
Bottom-line comparison
The E38 and W140 are complementary interpretations of a large luxury sedan, not interchangeable trims. The E38 generally makes the stronger case for an owner who drives for enjoyment: in one 740i-versus-S320 comparison it pulled harder at low speed, shifted more responsively and felt more composed on winding roads. The W140 makes the stronger case for passengers and long journeys, with the more forgiving ride and greater isolation reported in that same account.
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsReliability and running cost do not produce a universal winner. The evidence supports a buying method, not a slogan: compare like-for-like engines, verify the build and equipment, inspect known age-related systems, scan the car, obtain specialist estimates and price local parts and labor. A well-documented example of either generation is the right choice; a neglected example of either can consume the budget that its purchase price appeared to save.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
