The consensus is to change the oil tubes. I think they were redesigned. They are also cheap.

You can do a search on timing chain, and the standard advice is to change the timing chain, tensioner, and upper guide rails every 100,000-120,000 miles. There are those that say you can go longer, especially if you've done frequent oil changes, but if it were my car, I wouldn't let it go longer than 100,000 miles. You know, for piece of mine. That's why it's called preventative maintenance, don't they?

I haven't done a timing chain replacement, but have read several postings from those who have done it, and can't say anyone has ever done it this way.

Again, I recommend trying the search function for 'timing chain'. There are tons of posts in the archives.

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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".