Oil viscosity - why the 20W-50 BS?

moparlover said
the 20-50 is for summer and the 10-30 is for winter

i dont think you should run 20-50 year round unless you are in a very hot climate

however when it's 100 degrees out you should be runnin 20/50
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Bingo. I,m not running my rb stroker in Texas heat in traffic with watery oil. Aint gonna do it.Sure 5-20 is great at the track or in a mild street motor but not for hot blooded big inch beasts.