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Would it be ok to add a can of STP to the Shogun 3.5 GDI have been told it is unwise to use STP in close tolerance engines. It was made for older engines but of course it is still sold and must sell.

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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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