Oil weight can matter all right.

A clogged oil filter along with a stuck bypass valve could make your pressure drop. The bypass valve is built into the motor on M103, where most cars depend on the bypass valve being in the filter can.

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-tp


1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition