I also heard that you should replace the guides when you replace the timing chain because its the guides that cause it to go bad in the first place. If your guides are going out the new chain will not last that long

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1996 E320
2000 C230 Kompressor
1988 190e 2.3 - 225K miles, owned for 7 years. I cannot say enough good things about this car. Very well built, even at 225 it ran like new.