Oil Leaking - Diesel Bombers



12 Valve 2nd Gen Dodge Cummins 94-98 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps

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Old 09-06-2011, 06:19 AM
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Default Oil Leaking

I know its a pretty common issue with the 12 valves but can anyone tell me where my 98 is leaking oil from and if there is any way to stop it, also should i check my oil on like a weekly basis due to the oil leak?
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Old 09-06-2011, 09:06 AM
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It's probably coming from the valve covers. Can you give a bettter description, like the general area that the oil is coming from and how much oil is leaking out? It's a good idea the check your oil level weekly, leak or no leak.
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Old 09-06-2011, 11:33 AM
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yup but maybe it's leakin from the motor/tranny mount? On breather tube but that doesn't usually leak it out
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Old 09-07-2011, 12:14 PM
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Every 12 Valve leaks its a Dodge thing Do you have an idea where its comin from though? Front, back, left, right?
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Old 09-14-2011, 06:17 AM
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it looks like its coming from the front passenger side of the motor but im not quite sure, its a slow leak and the whole undercairrage is covered in oil
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Old 09-14-2011, 07:04 AM
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Default Oil Leaking

I would clean up the front of the engine with a powerwash/degreaser and see where the leak is. Could be KDP problem.
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Old 09-15-2011, 12:50 AM
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if it was on the drivers side i would say check the vacuum pump, I had a pretty good leak there. Can you take some pictures after you power wash it and drive it for a day or two?
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Old 09-16-2011, 06:25 AM
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Next time i wash the truck ill clean up everything under the motor and see if i can find it, the guy that had the truck before me said he had all the leaks stopped but i dont think he did, also what kind of oil should i put in my truck like weight wise and everything because it needs some oil
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Old 09-16-2011, 08:56 AM
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Valvoline Premium Blue, Delo 400, Rotella T, Mobil Delvac, all are 15w - 40 and will work fine.
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Old 10-01-2011, 01:00 PM
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hey i got my 97 thats leaking could u hit me with some info on what to look for with a leakin vac pump? mines coming from either the middle driver side or rear driver side.... i thought it might be my injector pump? is that common or easy fix?

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Originally Posted by huntingguy View Post
if it was on the drivers side i would say check the vacuum pump, I had a pretty good leak there. Can you take some pictures after you power wash it and drive it for a day or two?
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