Probably around the same.Dimebag Darrell said:
How long would you go on Mobil 1 full synthetic? Royal Purple supposed to be significantly better?
I'm not a lubrication guru, but spent a long time working in the petrochem industry and it was amazing at how many times I saw mechanical engineers fight to get RP spec'd, or if there were issues with gearboxes one of the first thing that was done was to switch the factory oil over to RP to see if that would reduce heat or help with internal vibration.
That sold me, and considering that the cost difference per oil change is pretty small oveall....I'll stick with what works for me and has worked for a good while now.
Mobile 1, Amzoil, Valvoline, Lubro Moly....all are higher end oils IMO.