Date registered: May 2008
Location: New York & Florida.
Mentioned: 0 Post(s)
Quoted: 20 Post(s)
You will hear a whole hell of a lot nonsense about this engine from people on how expensive is this to own and how expensive is that to keep running and all of that.... Mostly coming from people who NEVER had the M120...You can have reliability from a high upkeep engine. 12 Cylinders means many moving parts.
Reality is that you have to pay to play. The V12 is not something to be taken lightly. This engine is used in the Pagani if that tells you anything. We 96 600SL and that engine was fine. Had it for many years with little upkeep. The upkeep will come down to how long and much you plan on driving it for. Watch for the coil packs as they go and can be pricey. Spark plugs alone are a huge job. Look for the engine harnesses. I would start with the usual stuff, engine wiring, MAF wiring, throttle wiring and potential air leaks and oil leaks. Good quality upkeep can make the engine last forever as it was made to! I have seen a M120 with nearly a half of a million miles on it. The M120 engines have many gaskets to keep the oil in the engine and the engine takes LOTS of oil. If not used they will eventually leak all over so do not forget to get those gaskets checked too. Also make sure you have a good quality shop doing the checking over. Do not go to a random shop but one that worked on these before. My PPI for the M120 engine I purchased for a swap took a couple days to look over.
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