Lot 905078: 1989 Mercedes-Benz 560SEL

The 1989 Mercedes-Benz 560SEL (part of the legendary W126 S-Class generation) is generally a robust car, but there are a few well-known trouble spots worth knowing about—especially on a car with 175,000 miles like this one:

1. Timing Chain & Guides (Critical!) The M117 5.6L V8 uses a timing chain with plastic/nylon guides that will eventually wear and break. This is the big one—failed guides can cause the chain to jump and destroy the engine. The replacement interval is around 100,000 miles, so with 175k on the clock, you’ll want to verify this has been done. The good news? This specific car has service records dating back to 2007, so that documentation should tell the story.

2. Valve Guide Seals Worn seals cause oil burning and blue smoke on startup or acceleration. Common at higher miles but not catastrophic if monitored.

3. Self-Leveling Suspension (SLS) The hydraulic rear suspension can develop leaks in lines, accumulators, or the pump itself. You might notice the rear sagging after parking overnight. The system uses special hydraulic fluid that needs periodic flushes.

4. Rust Check wheel arches, trunk floor, door bottoms, and the fuel tank area—these are the usual suspects on W126 chassis cars.

5. Climate Control & Vacuum Systems The automatic climate control can have blower motor or servo issues, and the engine relies on vacuum lines for various functions. Aging rubber hoses can crack and cause rough running or HVAC problems.

The Silver Lining: This particular car’s extensive service history is a huge plus—most of these issues are manageable with proper maintenance, and a well-documented 560SEL is exactly what you want to find.

Want me to help you find other W126 S-Class sedans to compare, or do you have questions about what to ask the seller regarding that timing chain service?