These newer diesel engines don't require valve adjustment. Frequent oil changes & coolant changes are key to long engine life. NEVER allow this engine to overheat. The aluminum cylinder head won't last 20-30 seconds at high temps. If the engine runs hot shut it off. Have seen engines like this with over 500k mi & never apart. Take care & enjoy the car, as the W126 chassis is one of the best cars MB ever made.

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