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FTIR is useful to tell hydrocarbon (dino or PAO synthetic) from other lubricant base oil types like POE, PAG, alkylbenzene etc. As was said, FTIR will not tell PAO from dino basestocks.

Synthetic basestocks have no sulfur, so if you can factor out any sulfur from the additive package, you may be able to make a good guess based on that information. There are some very highly refined paraffinic basestocks that are virtually sulfur free as well, so this does not always apply.
Better late than never....
You can run viscosity @40 & 100 calculate the VI and assuming that the origional product was not a multi-grade you should be able to guess at a group 1/2 or 3 or 4 base stock. The other consideration is to heat the oil to a constant high tems say 150C and run continous TAN and see how quickly the product oxidises. Compare that to a group 2-3-4 and again you should be able to make a good guess.
Is all this fuss worth the effort??

regards.....
quote:
Originally posted by mr. Hughes:
Is there any way of testing an unknown oil to see if it is made up on only Syntetic base (PAO) oil or mineral base oil?


There is one way of finding if it is PAO or mineral ( even it is group III base ), that is with help of molecular weight and its distribution curve. PAO Mwt is narrow and mineral based mwt is wider. More information can be obtained from Mobil who market PAO
Kumar email kumartr2@yahoo.com
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