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Discussion Starter · #1 ·
I went to buy some oil and I started to talk with a person that works there and he said that he would recomend a higher viscosity of oil for the summer instead of a lighter viscosity rate for the winter. he recomnded a 10w-40for summer instead of lighter 5w-30 for the winter.
how Much if this is true?
Thanks.
 

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What year is your mustang? mine uses 5w20. If the engine has tighter tolerances using a lighter oil should be fine.
 

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Stick with the same viscosity of oil, just use full synthitic. Your car will run better and last longer. The only time I have ever heard of using different wieghtsof oil is when you r in an area were it gets REALLY COLD in the winter. But I don't believe that small of a change in wieghts would make a difference.
 

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i also talked to a mech. and he told me that changing different types of oil with a car can sometimes harm the engine. i recommend stay with what you have been using or upgrade to full syn.
 

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Deffinately switch to full synthetic. It will make your engine last longer.
 

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at part source here in sarnia ontario canada i was told to use 10w-40 also...so i did and it doesnt seem any different.....so we will wait and see what happens...ill prob change back though......the only problem is a longer start......
 
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