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15W-50 is a little thick, 10w-30 or 10w-40 is...>> (archive)

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Posted by ZV on May 16, 2001 at 06:41:03:

In Reply to: Engine Tapping: 15w-50 a fix or hinderance posted by Tone Capone on May 16, 2001 at 01:36:25:

I live in nor cal where it is going to be 90F plus for awhile. I've always used 15w-50 mobil one synthetic, and have always had lifter noise (tapping). Will a 5W-30 or 10W-30 help fix this?I've used 10W-30 before and i noticed the car revs much quicker, but is it at a loss of high rpm protection, what you think? The car is a 95 with almost 80,000 mi.

much better, even for the higher heat areas. It has been noted that the thicker stuff actually
INCREASES frictional heat, it's takes more power
to push the thicker stuff through the system, thereby causing slightly more heat.
A 10w-30 or 40 will let your car run better and
still provide the protection you need, just make
sure it's synthetic.

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