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Originally Posted by Topless
If it was my car (and it isn't) I would not sweat 5w30 oil at all for typical driving. Of course the 24hr Le Mans is out and probably the Pike's Peak race. Modern synthetic oils are light years ahead of standard 30w oil of just a few years ago. Just one guys opinion. Choose wisely.
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Since I am at 42K, I am in a very good spot to just take care of the 45K a little early and get the oil changed soon. It works out fine, because I'll have 18K between now and the 60K which will be well timed/scheduled to do 1 oil change between the 45K and 60K. ie, no added cost of planned maintenance from expedited intervals
Despite that, I was thinking...if its 60 out our 90 out, the engine is much much hotter than ambient air. The temp gauge is going to read about the same either way since I either drive on big roads or only take short trips for "city style" driving. As a result, I wonder how much this summer hear really affects oil viscosity.