my jeep currently has 183k miles on stock tranny and engine.i always use 10W~40W castrol GTX motor oil..but i have found out that after a certain period,oil lose (it has the oil pressure gauge) due to heat or friction...so should i use 20W~50W which is more sticky and good for high temperature egnine..so what do u recommend?thanks

 

A high miler like that one would prolly be well served with some 20-50. "Good" protection is pretty much out the window as your top priority now and the 20-50 should help you seal a bit better.

At the very least it won't hurt to try it and see. You certainly aren't going to do any damage.

 

If your engine is running hot, then go for a thicker oil. If not you're fine where you are. Oil lose at over 100,000 miles is bound to happen (engines get looser, rings/cylinders wear, etc.)..

 

I use 20W-50 on my 87 Legend with 216K on the odo. I started using oil (burning) and it helped alot. Won't hurt a thing.

 

4 those kinda miles only use 20-50