Jeep sitting 3 years...carbon grit in engin oil...what to do?

cburgin

Well-Known Member
Joined
Mar 20, 2005
Location
statesville/boone NC
Just bought a 93 yj with a 4.0L that has been setting for 3 years (busted d35). The oil has really bad carbon grit in it. I have talked to 2 different mechanics that said to drain the oil and fill the engine with kerosene (about a gallon) and let it idle for 45 seconds drain and repeat once more. After this, run a high detergent oil for 1k miles and chage again. Sounds risky with the kerosene...any input?
 
I have heard of doing that, but never done it before.
 
never heard of doing that in a motor...Many people do it in tractor rearends after water and etc has got into the gear oil.....
It will eat up seals and expose leaks..
 
I have run 3 qts kerosene, 1 qt oil, and one qt tranny fluid.
Run till up to temp
drop all fluid, and change. filter
repeat
then flush straight through with some kerosene with drain plug out.
Fill with good oil, run a day or so and change oil and filter again

Done this many times with great success
 
Chip, that's old-school stuff. I've done that to several old cars in my day and it cleaned 'em up pretty good. Years ago, we didn't have all those miracles-in-a-can sitting on a shelf at Walmart & Autozone. :driver:
 
And I learned it from and old school kinda guy. My dad when I was about 14. He drove a Taxi cab. He would buy a car with a lot of miles, do this, and run the miles up big time. I saw 400K plus on several, after he had done this.
 
IMO the engine needs to run at operating temperature for detergents or cleaners to be able to absorb contaminates. A good motor oil has plenty of detergents but some extra additives can't hurt. I always liked Rislone. I cleaned up a lawn mower engine that was full of sludge, probably never had an oil change, by changing the oil after each use ( about 1 hour). After maybe 6 changes oil stayed clean and lawn mower lasted for years.
 
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