Do any oils use di-esters anymore at all?

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15,061
Location
Canada
I know that base oils aren't the end-all, and that most oils are a blend of base oils...but are di-esters used as basestocks at all anymore? You hear about PAO's and Poly-ol Esters being used, and obviously group 3's, but no diesters. Back in the early days of syn oils they were the be-all and end-all of base oils - excellent in the cold, held viscosity perfectly, cleaned engines, and had low volatility. Are they still around in engine oils, or are they just not used at all? You just never hear about them being used! I know they are expensive to use, but with formulators looking for every edge, you'd think someone would bring them back into the mix, no?
 
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1,777
Location
South Carolina
Di-esters are still used a good bit. They are often still used as seal conditioners in small concentrations as they are much cheaper (currently) than polyols.
 
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10,004
Location
Waco, TX
Originally Posted by addyguy
Wonder if they are the ‘seal conditioning agents' in HM oils these days?
Maybe in the synthetic versions of various HM oils.....
 
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5,325
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Paramount, California
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