Question about Cars & Trucks
STP is a viscosity improver, or thickener, generally used in older engines which have begun burning oil. It reduces such oil consumption by thickening the oil when it is hot, and swelling rubber seals a little.
There is no reason to use it in an engine which is in good condition, and not burning oil more than normal. It may even be detrimental in that it would cut oil flow through small passages and bearing clearances.
If your engine is still in good condition, just use a good quality oil of the recommended grade, SJ or SH etc, and change the oil and filter regularly.
Posted on Apr 09, 2015
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Posted on Jan 02, 2017
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