Quote:
Originally Posted by redcar
I usually use STP oil treatment at every oil change, is it ok to mix with Synthetic oil? My 03 Impala has 115K, and my 01 Yukon has 118K. Thanks
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this STP additive was used widely many years ago ,,,usually on worn engines using alot of oil....it also had the problem of [in cold climates] not fully draining out,,,and causing a lot of debris to stick to the internal engine crankcase...
I would not recomend the use of these additives in these newer vehicles,,,,the engine you have is designed for a thinner oil..
stp would reduce the synthetic oils from doing their job ...which is to reduce wear and friction.....