Bought a 1990 420SEL a couple of months ago with 96,500 miles. The PO had replaced the timing chain and guides back in 2004 at 73,000 miles. I was worried about the guides as it has not been a lot of miles, but 15 years has elapsed. Doing a bunch of research and look at videos made me very worried that the guides would be bad.

I borrowed my airplane mechanics’ borescope and took a look inside the motor. Luckily the guides still are mostly white with a slight discoloration. What does the group think?

Thanks for your input.

Stephen

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__________________
Regards,

Stephen

2006 E500 Wagon “Werner”, 114,500 miles
1990 420SEL “Mr. C”, sold
1984 300SD “Dieter”, 2nd owner, 66,000 miles
2011 ML350 Bluetec “Baron”, Sold
2011 R Bluetec “Fancy”, Totalled, RIP
1994 S500 Coupe, Sold
1984 300SD 236,000, Sold
1979 300TD, Black Mariah, flooded in Katrina