Does it really matter?
I contacted Currie with a question about my 9", I also asked what they recommended for oil, and they said 85/140 non synthetic
I've been running synthetic Royal Purple in it for about a year or so.
I'm doing some work to the car and I'm going to put new oil in it tonight, is it okay to go ahead with the Royal Purple synthetic again?
or do I need to go buy some non synthetic?
I really don't see how it would effect my Detroit Locker or anything??
Jeff

