Friend just picked up a nice 1991 300D Turbo - he'd like to check valve clearances... how difficult is to do that on that car? I did the valve adjustment on my '85 300D but this newer engine looks quite different?!

Any advice -

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1987 Mercedes 300SDL; SOLD
1985 Mercedes 300D; SOLD
2006 Honda Pilot - wife's ride; 122K;
1995 Toyota Land Cruiser - 3X locked; 182K