derff96963
NAXJA Forum User
- Location
- Latrobe, PA
I have a 2000 xj (4.0) with about 95,000 miles on it and i use 10w-30. It will rap for a few seconds at startup. I just started doing this the last couple oil changes. I was using Mobile oil and when they changed to the extended life it started rapping at startup after I hit about 4000 miles. I would change it and it would be fine till about 4000 again. Then I switched to regular Castrol and changed it every 3,000 and didnt have a problem for the last two oil changes. then I had about 1,500 on it and it does it sometimes. usually first thing in the morning. The oil pressure is not high ever but it is over 13psi at idle and over 37psi at 1600 rpm. Which i believe are the factory specs. But it never goes over 50 psi ever.
The rapping sounded exactly like no oil pressure like when you first change the oil and the filter is not full yet. The oil pan was leaking a little so I decided to change the oil pump. The oil pressure is much better when cold. However after driving 10 minutes it drops just below 20 at idle. After about 2000 miles it really starts to drop more. So the last change I put 10w-40 in it. Its still about the same as the new oil after the oil pump change. My coolant drops alittle but the thermostat housing leaks and I haven't got around to changing the gasket yet.
Any Ideas why the oil pressure drops so much over the life of the oil?
The rapping sounded exactly like no oil pressure like when you first change the oil and the filter is not full yet. The oil pan was leaking a little so I decided to change the oil pump. The oil pressure is much better when cold. However after driving 10 minutes it drops just below 20 at idle. After about 2000 miles it really starts to drop more. So the last change I put 10w-40 in it. Its still about the same as the new oil after the oil pump change. My coolant drops alittle but the thermostat housing leaks and I haven't got around to changing the gasket yet.
Any Ideas why the oil pressure drops so much over the life of the oil?