Has anyone noticed and increase in oil temps with the use of a 10W40 in place of 5W30?

Oil temps at LRP last Saturday were mighty close to 280 degree F. Outside temps were 37-40 degrees. I'm afraid to think what the temps will be when its 80 degrees F.

 

Unknown to me...MINI recommends 5W30 so that's what I stay with. Like to hear what others have to say that "track" more often than I do & their results.

 

A heavy weight oil increases the friction between moving parts, increasing produced heat. Also, since a heavy oil flows slower throughout the engine, the oil does not have the ability to carry off heat produced at the various points in the engine.

Heavy oils are more suited to 'drag racing' oriented cars where high power is needed for short times. Tracking your car for lengths of time demand a lighter weight, high quality oil for optimum performance.

10w-40 oils are generally considered a no-no in most modern engines unless there is a significant amount of wear and clearances in the engine.

 

I keep telling everyone I'm an engine moron...now you know why. I've never ever used a 10W40 before

Back to Mobil 1 5W30

Thanks for setting me straight...as did Onasled