Does Havoline 5w30 have any ester in it?

[John Smith]

Thinking of using it as AutoRx rinsing oil, as I have difficulty finding other recommended oils.

Thanks.

 

[Patman]

AFAIK, no conventional oil has esters in it, only synthetics or the high mileage versions. Esters are expensive so it's not likely you'll find them in a $1 quart of oil.