The problem with friction additive oils & any friction mod oils is that the friction oil makes the bore in your motor very slipery & eventuly leaves a very hard film in the bore & then your rings don't do there job & lets oil pass the rings to ezy, eventuly leading to excesive oil usiage & loss of compression in your motor. I have been using Penrite ever since it came out & not once have i ever had a problem even when i raced cars back then. I did rember in the 70s Gastrol put to much friction additives in there oils & stuffed up a hell of a lot of motors. Just me ten cents worth!...
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