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"There is a 1 way check valve in the upper oil pan where the drain tube goes into the oil pan. Its is designed to prevent oil in the oil pan from being sucked up into the air filter. However the experienced mechanic I talk to has never had to replace the check valve. I'll check that out tomorrow."
The existence of this valve is important. In discussions of high oil consumption in past threads, some people have denied the existence of such a valve. I believe it is important to raise awareness of its existence. If this valve fails and pressure builds in the crankcase I think it is possible for oil to be forced into the intake.
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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