[Jim Hawkins]

All I have ever used is mobil 1, 5w20 or 5w30. Patterson had me use this oil back in 1990 and have used it ever since. On the dyno at Madcap drained the Gibbs break in oil and switched to the mobil 1 and saw no difference. Actually picked up a couple. Filter and bearings always look good. This is the regular synthetic stuff at the parts store, not the race oil you have to special order. Had some Gibbs lightweight sitting here for about a year and when I poured it out of the bottle it had a inconsistent look to it. Like stuff had separated. Drained that one qt. out and stayed with mobil 1. I stock up on it when it is on sale at Napa and it always looks fine even after sitting for a long time.
Also I work on the forklifts out here at a facility where they used to do all the blending for Gibbs. All the oil used to come from this place before the switch to the Driven branding. I asked one of the lab guys there about the separation of the additives in the oil and he said you may have to shake the stuff up if it sits awhile. Seemed weird to me to have to do that!