Re: Flathead smoke
The API standards or any other standard says what the oil should be able to do...not how it should do it or how the different companies should mix their product.
So the oilcompanies is constantly trying to develope a product that can meet the higher standards at the same time as the old ones and if they can a bit cheaper.
The brand name and designation of the oil can remain while they adjust the mix of it.
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