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R129 Roadster
Mercedes-Benz SL · Roadster · 1989–2001
Pop-up rollbar SL — the 90s design landmark.
Production run
1989–2001
Engines covered
5
Avg. part price
—
19902026
Interactive systems map
Inspect the R129
Tap a hotspot to inspect that system
Systems map
Where it goes wrong
Each numbered hotspot counts the documented failure points in that area. Select one to see the specifics for this chassis and engine.
Failure points by system
Engine3
Cooling1
Intake1
Electrical3
Exhaust1
Transmission1
Documented issues per engine
4M104
4M119
4M120
4M112
4M113
Known weak points
What breaks on the R129
Wiring harness insulation crumbling (1992–1995)Diagnose →Head gasket at the rearDiagnose →Wiring harness degradationDiagnose →Timing chain tensioner railsDiagnose →Wiring harnessDiagnose →Coolant leaksDiagnose →Head bolt / gasket leaksDiagnose →Intake manifold flapDiagnose →Camshaft adjuster magnetsDiagnose →Motor mountsDiagnose →
Guides & playbooks
R129 playbooks
Maintenance scheduleGive me a mileage-based maintenance schedule for a Mercedes-Benz SL R129, including the items the factory schedule skips.Buyer's inspectionI'm inspecting a used Mercedes-Benz SL R129. What exactly should I check, test drive and look for underneath?Build planPlan a staged performance build for a Mercedes-Benz SL R129 that stays reliable as a daily driver.Fault code lookupI have a fault code on my Mercedes-Benz SL R129. Walk me through what it means and how to confirm the cause.
Fits your R129
Parts & tools
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