Quote:
Originally Posted by bmwstephen
m10, m20, m54, S50, s52, s54, s62, s65 rebuilds at 120k ish. Especially, when you have to tackle the headgasket, or vanos, you remove the timing cover at which point you tackle the guides and the chain. Every one of them even if you replace the guides, the chain has some slack cause the metal does stretch over time. I expect no different with current engines either.
Edit my experience: BMW owner for over 20 years. I never get into them when new either so by the time I get into them, I already know their issues and fixing them.
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So you are not disassembling engines because there are timing chain issues. You are disassembling them for other reasons and replacing the timing chains while in there because you don’t want to duplicate the effort to go back in when the chain might really need replacement in another 100k miles. I would do the same thing. I replaced the chain on one of my S52 when I had the head and front cover off and the motor had 100k even though the M50/52/S50/52 are known to go 250k on original chains.