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Cos if u are running an air cooled VW unit it was designed for thicker oil ( as the unit gets bloomin hot compared to a water cooled engine) thin oil = poor oilr pressure= rapid engine wear = BANG
So stick with the maunfacturers recommended oils for best results.
sae 20/50 was the design oil and good quality oils plus deep sumps and oil coolers do the job nicely on a tuned engine

hope that helps

Magwa
Things are getting clearer having heard directly from the engine builder who says 20-50 weight is what he recommends. But then the Vintage Owners manual (2002 edition)says to use straight 50 weight. I've got it, 50 weight if you drive in AZ in the middle of summer and the rest of us 20-50, unless you spend your winters driving in Montana. Thanks for your time. Karl Dempwolf
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