I've read most of the threads on high mileage oils here and I was wondering of anyone is currently using any of them (i.e. Castrol high mileage/pennzoil high mileage etc.) At wallmart you can get 5 quart jugs of castrol high mileage for 10.28 (regular castrol for 6.88) Is there really much difference between the two? I know that the high milage oils do not have the "energy conserving oil" on them (10W-30) so will your gas mileage change? Any info?
Thanks
Thanks