It is hydrocracked mineral oil. Better than group II, but not a "true" synthetic.
http://en.wikipedia.org/wiki/Synthetic_oil
Note- "true" synthetic is my term, I don't buy into the marketing BS that Castrol started about synthetics.
Rotella Synthetic Smell - Different
- Thread starter cdcole
- Start date
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It is hydrocracked mineral oil. Better than group II, but not a "true" synthetic.
http://en.wikipedia.org/wiki/Synthetic_oil
Note- "true" synthetic is my term, I don't buy into the marketing BS that Castrol started about synthetics.
Barry Bowen
Gold Member
Possible solution to the smell problem gentlemen, switch to Amsoil. They were some of the original inventors of true synthetic oils, and they still make some of the best. I have run the 15W40 in all my diesels. They also have a 5W40 that meets all the specs, and does not have an odor problem.
