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I run 20w50 Brad Penn in my car. Its a bracket car, so if I give up a couple horsepower with the thicker oil I'm not too concerned, I'd rather have the motor live a longer healthier life.

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My motor has 4 yrs. of pounding on it , during the spring,summer and some fall weather depending when it snows here Plus two different dyno sessions with around 35 pulls each session. I have driven and raced it enough, shifting at or above 7000 rpm , to have two Mopar brand solid roller lifters break the wheels in half. The rod and main bearings look absolutely perfect, the thin oil circulates quicker and my oil temps never exceed 200 F even in slow traffic in the summer Most street motors don't begin to strain most regular motor oils, unless you tune it bad enough to cause the motor to detonate, all bets are off when you make the motor detonate or ping Remember the two main reasons we use motor oil in our motors is to lubricate and cool, there is no magic in thicker oils