Do Group III's need esters too?

MolaKule

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Many of these oils use small amounts of PAO's and HYDROXYALKYL CARBOXYLIC ESTER's or like esters for slight seal swell properties.
 
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A friend of mine recently used Can. Tire Synth. Blend and has a serious oil leak now. I too had leaks when switching first to Syntec in 1998 and this past spring when trying Havoline 5-40 synthetic. Remember reading that M-1 uses Esters to control seals and prevent catastrophic leaks as seen in the 70's. Do Group III oils need these as well? Do they have them?
 
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