Use only OEM. Buy from the likes of fcpeuro.com.

If you ever hear chain rattle at start turn off the car order the part and don't run the engine again until New part comes.

The guides break because lost tension not from age. I've done the job twice and it's very apparent how the failure happens and it can likely be indefinitely avoided.

If I had m62tu I would change at 100 k miles and every 50 k mi. after. I've found examples of 400k with original guides and zero examples where people didn't notice "weeks" of the telltale startup rattle before destruction.

M62 has a giant single chain and about 3-4' is unsupported, and held up into the main bottom chain guide only by tensioner.

When tension gets low, as you drive over a bump in the road, inertia of the chain holds that several feet of chain down as the engine is pushed up. The chain is slapped back up into the plastic shoe of the chain guide which is very very brittle and cracks.

Once cracked it snowballs quickly.

It does not need to happen I've read of half a dozen original guides lasting over 1/3 million miles.

Make sure you replace the crush washer. My buddy that refused to believe me paid for it in a quart of oil per week until he replaced it after the fact.

Some tensioners don't come with.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)