Originally Posted By: itguy08
Originally Posted By: Tom NJ
To fully test against the SN specification would cost about half a million dollars, hence PQIA cannot state that an oil meets the specification without running all of the tests. It can, however, report that an oil does not meet a specification if any the results from the tests they do run fail to meet the requirements of a specification.
So then the next question would be what exactly is the spec? Is it along the lines of:
Must contain xxx ppm of additive yyy, aaa ppm of bbb additive or must it meet some wear, detergency, etc standards?
Or: Could an oil that "fails" in some additive still pass the whole battery of tests that make up the API certification?
Does DG even sell SA oil? The pics posted on Pg 4 of this thread showed SF rated oil with DG's branding.
The only additive specified in the SN specification is phosphorus (in the form of ZDDP), which has a specification of 0.06 - 0.08%. An oil with a phosphorus content outside that range fails the phosphorus specification, and therefore the SN specification. All of the other specifications for SN are physical and performance specifications for things like viscosity, wear, corrosion, deposits, volatility, etc. Some are bench tests and some are full blown engine tests.
Yes DG does sell and SA oil under their brand.
Tom NJ