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Old 02-08-2011, 09:58 AM   #1
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2002 jeep wrangler engine failure

I own a 2002 jeep wrangler that had an engine failure. it has 67000 mile on it. at the last oil change, i switched to castrol synthetic oil. after about 1000 mile the engine failed. the oil turned to a gum like substance. i have owned the jeep since new, always serviced it faithfully and it has never been in the mud. it is a 4.0 litre. any suggestion.

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Old 02-08-2011, 11:08 AM   #2
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Pretty sure switching to synthetic is a bad idea on an older vehicle. I think it loosens all the build up and probably is what created the crud. I'm sure others with more knowledge than I will chime in soon. Sorry about your bad luck.

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Old 02-08-2011, 05:43 PM   #3
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I've switched to synthetic in many older engines and never had a problem. If you have been using modern oil and changing it as recommended you just don't have a big build up of gunk to become loosened/dissolved. What "failed" in the engine, exactly? No cracks in block or head or leaky head gasket contaminating the oil with coolant?
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Old 02-08-2011, 06:24 PM   #4
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My first thought was the head gasket. Is there oil in the coolant or vice-versa? Did it overheat before it failed? Were there no signs that it was about to go?
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Old 02-08-2011, 06:36 PM   #5
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Who has been doing your oil changes? You or a Goofy Lube type place?
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Old 02-08-2011, 07:26 PM   #6
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Old 02-09-2011, 09:57 AM   #7
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I wasn't driving, so i will tell you what my wife told me. Driving down the interstate, engine light came on, and then a loud band. No sign of overheating before the failure. Started pulling parts off yesterday, and found a hole in the side of the block. Haven't removed the pan yet, but sounds like a rod came loose. No oil in the radiator or coolant. I changed my oil myself using 10w30 pennsoil, before switching to synthetic.
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Old 02-09-2011, 02:31 PM   #8
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Sounds like you spun a rod bearing and broke the rod. With only 67,000 miles on the JEEP I would probably look for remanufactured short block. Your crankshaft more than likely is scored. A salvage yard engine is good too,but I wouldn't want more than about 70,000 miles or so on it. Not knowing how it has been maintained I would be tempted to rebuild it just for the peace of mind. If you opt for remanufactured I wouldn"t want 10 or 20 under on the main or rod journals. I have gone 30 over and had no problems on the mains ,but I did have problms on the rod jounals.Thats just me.
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Old 02-09-2011, 02:34 PM   #9
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you can get another engine pretty cheap, just the basic engine, and transfer everything from it to the new engine.


or sell it to me as is....
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Old 02-09-2011, 02:39 PM   #10
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67k blows! Sorry for the loss! Never had issues with changing to synthetic in all my vehicles, old and older. Having worked in a race engine shop...sometimes things just happen, and specific causes go un found!
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Old 02-09-2011, 04:46 PM   #11
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Even used engines aren't cheap

There are so many engine failures that even a used engine will cost $1200 to $1600. I looked everywhere and Advance Auto had the best price. They give a year unlimited mileage warranty on the engine itself. The labor is on you.

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