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Every 30,000 miles
Every 50,000 miles.
The engine oil should be changed every 3000-5000 miles
Gear oil should be changed every 4,000 to 5,000 miles. Motor oil should be changed every 3,000 miles to keep the engine running clean.
Are you talking about the rear differential? Yes, you should. All fluids will have to be changed at certain intervals.
Change the oil filter every time you change the oil.
The average motorist should change the oil every 3000 miles. Oil should be changed more often if driven in dusty condition.
The oil should be changed every 6 months or 3,000 miles, wich ever comes first.
The front differential uses 80w90.
If you do not drive it often, I would recommend getting it changed every 3 months. That is what many mechanics tell you to do.
I change it every other oil change.
About every 3000-6000 miles