What kind of oil is the best to use.. the stock oil or one oh the otheres... veh is a 96 xj 35s d30 front 8.25 rear lockers

 

80W90 is fine, though some use 80W140 for heavy duty use. If you want to step up to a synthetic, many will be 75W90 (or 75W140); the "75W" just means better cold-temp performance. Any GL-5 lube will serve you well.

 

If you're running lunchbox lockers I might be inclined to go synthetic for the better shear strength. However, if your Jeep goes swimming, save some cash and buy the cheap stuff as you should be changing that oil frequently.

 

Thanks for all the info