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10w40 Motor Oil?
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Question
Webb
Hi I own an 2001 chevy K2500HD, 8.1L engine. My question is if 10W40 oil is too much? Ive always used 10w30, this time a tech at pepboys recomended I use 10w40. Said it was a summer oil. So I put the heavier oil in and took it for a test drive. I noticed my oil pressure gauge is about 20 psi higher than it normally is. usually gets up to about 40 psi now it goes right up to 60/70 psi. Thats about 3/4 of the way up the gauge instead of hoovering around the middle. Also noticed that my motor makes a deeper sound when revving. Not quite like a deisel just lower pitch sound than it had before.
So I went to autozone this time to ask them about it the guy there said I could blow my motor if the pressure is too high, and I should do another oil change back to w30 right away. So I went back to pepboys and told them my situation and they said it would be fine, its a summer oil. Only way I would blow my motor is if Im using it in the winter. Now Im really confused and worried. Im hopeing I dont have to bite the bullet and change it out again? Or will my engine be fine for the next 3,000 miles with this oil? Thanx in advance.
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