Timing chain/guide change intervals for MB M119 engine "In my opinion" are as follows:

100k miles - Really cautious
150k miles - Just about right
200k miles - You are on borrowed time

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Thanks,
Dave

1998 BMW 540i Sport
1995 E320
1992 400E
1989 BMW M3
1979 Triumph TR7 (1st car)
1986 BMW 735i (Sold)
1980 BMW 320i (Sold)