Here's the true deal. Newer cars where the manufacturer has recommended 5W-20 there are solid reasons for it. All the machine work and bearing fit-up inside these engines are a few tenths of a thousandths tighter. It is a fact the manufactures are trying to squeeze more fuel economy out of new cars. Low viscosity oil allows the oil pump to mechanically turn easier freeing up otherwise lost horsepower.
In my opinion you may be skating in thin ice. Your engine was designed to be used with 5W-30 because of all the minutely larger internal clearances of the engine. If I were you I'd install an honest to goodness oil pressure gage in your car. When your motor is up to temperature I'm pretty certain your oil pressure would be higher at all engine RPM's if you used the recommended 5W-30. Reasonable oil pressure saves engine bearings.Potential for problems with 5W-20 oil?
so how far up are you in the sae{society automotive engineers} do you have 25 years of design and construction of engines. when did you complete your last testing of structural integrity of gas fired engines. do what they tell you save yourself from yourself
Probably not - but with 115,000 miles and no unusual problems, why would you want to change horses in the middle of the stream now?
stick with the 5w-30 in synthetic.
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