We don't use any additives in race engine oil,we use top grade 100% synthetic oil,anything from 0W-20 to 20W-60 grade depending on application,most cost around £10/litre.
Whenever I've enquired from oil companies about engine oil additives ,I've been told "if there was any benefit we would put them in our oils!"
or "we use them in our oils anyway"
But that doesn't mean to say that there couldn't be a benefit from additives with some of the low tech/low spec. aircraft engine oils.
Lister
