For enthusiasts and potential owners of the W140 series Mercedes-Benz, understanding the nuances of these classic vehicles is crucial. Having spent considerable time researching and living with a 1992 600 SEL, I’ve gained valuable insights into the common issues that prospective buyers, especially those considering a 400 Sel Mercedes, should be aware of. While my direct experience is with the V12 flagship, many underlying characteristics and potential pitfalls are shared across the W140 range, including the esteemed 400 SEL model.
One frequently discussed topic among W140 owners is the instrument cluster. Interestingly, much like others have reported with early models, the 600 SEL I acquired had its dash cluster replaced under warranty. This resulted in a digital mileage display, a feature that seems to be somewhat common in early W140s due to replacements.
Another well-known issue, particularly relevant in warmer climates, is the air conditioning evaporator. My 600 SEL, despite residing in Florida, has thankfully not yet required an evaporator replacement and the climate control system functions admirably. However, the potential for failure and the significant repair cost, often cited around $3,000, is a point of concern for any W140 owner, including those with a 400 SEL Mercedes. The degradation of the evaporator, reportedly linked to mites on leaves affecting the system’s metal components, is a factor that may be influenced by garage storage, which could explain why some systems last longer than others. It’s also plausible that later production models incorporated improved materials to mitigate this issue, a detail worth investigating for 400 SEL models from different production years.
The right rear lift regulator is another component known for its susceptibility to failure in the W140 series. True to form, my 600 SEL had indeed undergone a replacement of this regulator. This issue, while perhaps not unique to the 600 SEL, is certainly something to be mindful of when inspecting any W140, including a 400 SEL Mercedes, before purchase.
In terms of driving dynamics, early W140 models, including potentially the 400 SEL, were reported to have front suspension vibrations at higher speeds. This issue was addressed in later production runs. Therefore, a thorough test drive at various speeds is crucial when evaluating a W140. If the car, be it a 600 SEL or a 400 SEL Mercedes, exhibits smooth and stable handling at speed, it is likely that this early suspension issue has either been resolved or was not present in that particular vehicle.
One final point, particularly relevant to the high-performance 600 SEL but possibly less so for the 400 SEL Mercedes due to different factory tire specifications, concerns tire wear. Early 600 SEL models equipped with Z-rated tires experienced premature wear. This led to a class-action lawsuit, with owners receiving compensation in the form of vouchers or cash. A suggested solution to improve tire longevity was to “downgrade” to tires with a lower speed rating. While tire wear is a general maintenance item for any vehicle, understanding the original tire specifications and potential wear patterns is useful knowledge for any W140 owner.
Ultimately, despite these potential issues, the W140 Mercedes-Benz, including the 400 SEL, remains a magnificent vehicle, especially for highway cruising. The robust construction and substantial feel contribute to a sense of security and comfort, making it an excellent choice for families and long journeys. For anyone considering a 400 SEL Mercedes, being informed about these common points of attention will aid in making a well-considered and satisfying purchase. Thorough inspection and understanding the maintenance history are key to enjoying the enduring qualities of these iconic automobiles.
