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I usually use 10w30 in the summer and 5w30 in the winter.. I thinking of trying 5w50 this time. Will I get better engine protection at high temps and less gass milage?

I figure MikePGT can shed some light on this viscosity issue. ;)

Thanks
 

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I would advise against 5w50 in the winter. It's much thicker than 5w30 and won't flow as well. Generally, thicker oils mean lower gas mileage. People use them for higher mileage engines sometimes in an effort to reduce oil consumption.

I have two 70s cars that call for 20w50...there's a reason. Manufacturing tolerances in newer cars give tighter clearances where thinner oil can flow.


Tyson
 

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Discussion Starter · #3 ·
Thanks Tyson That's my aim and is what I figured. Plus I drive the car extremely hard and it is summer. I figured the thicker oil would protect my engine a lot better when it's really hot.
 
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