If everyone is right about the pooling of oil in the back of the cylinder heads, then the rear plugs should show it.

Pull the plugs and compare them.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)