Quote:
Originally Posted by California98Civic
The source I cited in post #13 above claims Group 4 PAO based synthetics do not need VI additives. It is the Group 3 types, of which Mobil 1 is an e.g. (though a good oil that I am running right now) that need them because they are not strictly absolutely synthetic. Group 4 synthetics should not, therefore, have this break down problem, no?
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Not sure...
This info from aporigine, post #7, puts Mobil1 in Group 4 -
"Mobil 1, same weight, is largely group 4 PAO. Its numbers are 165 and -65 deg C. Additional factette: M1 5W-30 needs no viscosity improvers (those long gelatinous shear-sensitive molecules that allow formulation of wide weight ranges) to achieve 5W-30 spec"
Jay