I idle at about 900 rpms and use mobil 1 SAE 50 racing oil. But, I live in southeast Texas where the average temp is in the mid 80's to low 90's. In a colder environment, this oil would be like molasses in the engine.
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'90 GT Under construction
Best E.T. = Fast @ High Speeds - OK So I Lie. So What!!!  
04 F-150 STX 4.2L 5 spd
Rice Haters Club Member #128
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