Compression test will not check the rings. Have a leak-down test done. Oil in the air filter was the beginning of the end for our beloved 300D.

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Chuck Taylor
Falls Church VA
'86 300E 5 speed
'95 C220 (wife's car)
'98 Porsche Boxster
Past: '79 280E, '82 300D (18 yrs), '77 240D,
4 250C's