Gulf Classic 20-50 mineral oil

Technical advice Q&A

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#1 Gulf Classic 20-50 mineral oil

Post by pmansson » Sun Jul 14, 2019 12:23 pm

I have used several brands of this oil in my Jaguars over the last 35 years.
Recently Iwas convinced that the Gulf oil with extra high level of zinc additive (more in the 5L metal cans than in the 4L plastic cans) is even better for our engines.
I have now used it for the 2 most recent oil changes. What immediately struck me is how fast the oil goes through the cyl head and block. Took about half the normal time.
It flowed like the 5-30 synthetic oil that my wife´ s Audi uses.
How can this be possible...?

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