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  #36 (permalink)  
Old 07-07-2010, 10:08 AM
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Cobra Make, Engine: SUPERFORMANCE w DOUG MEYER ENGINE
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My builder specifically built my engine for 20/50 high zinc dino oil.
Roush builds motors specifically for 10/30 with tight tolenances. So putting 20/50 in there is not a good idea.
Engine builders have their own recipes for tolerances etc...
There is no "one size fits all" scenario.
Just for kicks I tried 10/30. Lost 10lbs of pressure. Switched back to 20/50 and was right back to 25 idle about 60lbs driving. Right where it should be.
Have about 15k on the engine. Never a problem, and the oil flows on the rockers perfectly.
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