what type and proportion of new esters are in M1 Supersyn?

[bigpaulo]

I read that the new M1 Supersyn has esters in it that were not found in the M1 Tri-synthetic formulation... does anyone here know what types of esters are now found in M1, and in what proportions? (1%? 10%? more?)

And why are they better than straight PAO? Increased additive solubility? EP/FM/other additive effect?

 

[Bob Woods]

PAO's will cause the seals to shrink, ester will cause the seals the swell. Put them in, in the right combination and it keeps the seals from leaking.

 

[Al]

I recall that Molakule gave his best guess on the amount of Ester in Mobil 1. I believe he mentioned 15%. I can't find the thread

The Ester also improves the lubricity of the PAO in addition (as was mentioned) counters the seal shrinkage of the PAO and it enhances additive solubility.