Royy
Full Access Member
My KJ (3.7 4wd) goes through quite a bit of oil, around 1 quart per 800-900 miles.
I only use 5W30 Mobil 1 full synthetic high mileage oil, and change it every 4,000 miles.
As far as I can tell, there are no leaks anywhere. Valve cover gaskets are in good shape, and I just replaced the front crank seal. I replace the PCV valve every 10-15k miles. No visible blue smoke from the exhaust.
When I first got the Jeep, for the first couple of months LOTS of milky-looking gunk would appear in the oil filler neck (which seems to be pretty common based on other posts here on the forum). Replacing both crankcase breather hoses with breather filters completely fixed this issue - no more gunk whatsoever. But it didn't have any noticeable effect on the oil consumption.
I understand that oil consumption is probably caused by bad valve seals. However, replacing these is not something that I feel comfortable doing myself, and at the moment I just can't afford to pay a shop $1000+ to do it.
So, is there anything else I can do to reduce the oil consumption? Maybe use a different brand or weight of oil? Are there any additives that do actually work?
I only use 5W30 Mobil 1 full synthetic high mileage oil, and change it every 4,000 miles.
As far as I can tell, there are no leaks anywhere. Valve cover gaskets are in good shape, and I just replaced the front crank seal. I replace the PCV valve every 10-15k miles. No visible blue smoke from the exhaust.
When I first got the Jeep, for the first couple of months LOTS of milky-looking gunk would appear in the oil filler neck (which seems to be pretty common based on other posts here on the forum). Replacing both crankcase breather hoses with breather filters completely fixed this issue - no more gunk whatsoever. But it didn't have any noticeable effect on the oil consumption.
I understand that oil consumption is probably caused by bad valve seals. However, replacing these is not something that I feel comfortable doing myself, and at the moment I just can't afford to pay a shop $1000+ to do it.
So, is there anything else I can do to reduce the oil consumption? Maybe use a different brand or weight of oil? Are there any additives that do actually work?