[ercoupe-tech] Multigrade oil use

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I tried multigrade about a year back, and I immediately got an increase 
in oil use - a lot!  Turned out that it was blowing out the oil vent 
line at a prodigious rate..., (the belly sure wasn't going to squeak as 
well as it got oiled...!)-soon as I went back to straight weight, oil 
use returned to normal.  I do have the crankcase vent elbow extension 
that is supposed to help with the vent oil loss. Anybody else seen this?