The 1987 Mercedes-Benz S-Class is a full-size luxury sedan from the W126 generation, known for its vault-like build quality, understated styling, and long-distance comfort. It’s ideal for buyers who want a classic flagship Mercedes with a refined driving experience, strong safety engineering for its era, and a premium feel that still holds up today. In the late 1980s market, the S-Class sat at the top of Mercedes-Benz’s lineup, competing as a prestige executive car with an emphasis on durability and engineering. For 1987, the W126 was in its later production years, benefiting from years of incremental improvements and a wide range of trims and powertrains.

- W126 chassis refinement: Solid highway stability, quiet cabin tuning, and a heavy-duty structure that helped define Mercedes’ flagship reputation. - Engine options by market: Common U.S. models include the 300SDL (3.0L turbo diesel inline-six) and 420SEL (4.2L V8). Many markets also offered inline-six gas variants (such as 260/300-series) and V8 options depending on region. - Long-wheelbase comfort (SEL models): Many 1987 S-Class variants were offered in SEL form, adding rear legroom and a more chauffeured, executive-oriented layout. - Classic Mercedes safety focus: Strong crash structure for the time, available ABS on many trims, and a design philosophy built around occupant protection and stability. - Luxury equipment and durability: Available power seating, climate control, and high-quality interior materials that often age well when properly maintained.

Shoppers researching 1987 Mercedes-Benz S-Class reliability will find that these cars can be very dependable for their age, but they are not “set it and forget it” vehicles. Condition and service history matter more than mileage alone. Here are common 1987 Mercedes-Benz S-Class problems and issues reported by owners: - Climate control and vacuum system leaks: Aging vacuum lines and actuators can cause erratic HVAC operation (air stuck on defrost, weak airflow direction changes, or inconsistent temperature control). This often shows up on higher-mileage cars, commonly past 100,000–150,000 miles, but age is the real trigger. - Automatic transmission shift quality and leaks: Many W126 cars develop rough shifts, delayed engagement, or fluid leaks from seals as mileage accumulates. Problems are frequently tied to neglected fluid service, worn mounts, or vacuum/adjustment issues rather than catastrophic failure, but a rebuild can be costly if ignored. - Timing chain/chain guide wear (especially V8 models): On V8 variants like the 420SEL, timing chain guides and related components can wear with age and mileage. Preventive service is important because neglected chain components can lead to serious engine damage, often a concern as cars approach or exceed 150,000 miles. - Diesel-specific concerns on 300SDL: Turbo diesel models are known for longevity, but can suffer from vacuum-related shutoff issues, tired engine mounts, and aging glow plug systems that cause hard starting. Cooling system condition is also critical on older diesels to avoid overheating-related damage.