how often r u soppesed to do an oil change on the diferential

 

If you have never done it i would do it right away. I change oil as soon as i get a car. I would recommend amsoil severe gear 75w140 gear oil. It should last the life of your 10 bolt. Studies have shown that when changed when new diffs last longer. Just my 2 cents but some will say never. $25 is cheap insurance either way.

 

well my car it only has 70,000 miles i will do it

 

Nothing I would change in a street car until maybe 100K miles or it the rear was apart for another reason. Race car - every season for a drag car.

Rich