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Old October 29th, 2006, 08:02 PM   #1
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Default 318 using lots of oil?

I have a 97 Ram with a 318, I don't know what the deal is but it uses a quart of oil every 800 to 1000 miles!! It has 150k miles but still runs strong! Just uses oil like crazy!! Has anyone else had this problem, or have any idea what it could be?
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Old October 29th, 2006, 11:49 PM   #2
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I have heard of the plenum gasket leaking, its under the intake man, and that will cause it to eat oil. I belive I have the same problem going on just havent checked it out..( least im hoping) anyway, take off the air cleaner and look down inside the throttle body and if its all oil that most likely is your probelm ( so ive been told)
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Old October 30th, 2006, 06:58 AM   #3
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there is another gasket under the intake? i didn't know that, i'll have to check that out
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Old October 30th, 2006, 07:02 AM   #4
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I dunno about plenum gaskets, but i have seen the engine sludge up enough to plug the oil return holes in the heads with high miles. after the return holes plug the valve stems are submerged in oil and can't help but burn it. I would start there first.
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Old October 30th, 2006, 07:05 AM   #5
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yeah, lot easier to pop the valve covers off an check that first
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Old October 30th, 2006, 09:10 AM   #6
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Look down thru the throttle body. If it is wet/oily in there, your plenum gasket is shot. This is extremely common for the 318/360 Magnum motors. There are basically 3 options. You can replace the gasket with a stock replacement that will eventually go bad again, replace the gasket and the thin sheetmetal plate that bolts to the underside of the beerkeg style intake, or upgrade to a Mopar single plane intake that doesn't have a seperate plenum/gasket. Those are ranked from cheapest to more expensive. No matter what you do, you need to pull the intake off to reseal everything.
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Old October 30th, 2006, 02:57 PM   #7
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I have a 98 ram and that is exactly what my problem was. It is a known problem that they will acknowledge but chrysler will not fix it. Mine started using oil just after the warranty was up on it. Of course, then I didn't know what the problem was and didn't get any answers that made sense when I took it anywhere locally. I finally started asking on the internet and got my answer right away. Pulled the intake and there was pretty much no gasket left. Replaced it with a new one and my truck runs better now with over 100,000 miles on it than it did when it had 40,000 miles.
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Old October 30th, 2006, 03:48 PM   #8
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Yeah been there done that twice. It definitely cause comsumption of a lot of oil, and some smoke here and there. Yeah you'll get better gas mileage and it will run much better and smoother
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Old October 30th, 2006, 03:56 PM   #9
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lower intake gaskets are really common. if they go bad you should get a slight vacuum in the crank case. take all the hoses pcv and breather out cover all but one hole and see if there is any vacuum at the one you didnt cover. it wont be much but if there is any you need intake gaskets. i think a dollar bill held over the hole will suck in towards it if you have a leak.
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Old October 30th, 2006, 04:04 PM   #10
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i think a dollar bill held over the hole will suck in towards it if you have a leak.
Are we talking about trucks or women???
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Old October 30th, 2006, 04:16 PM   #11
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i think i will just check it and change the gaskets, i already have 150000 so who knows if i get another 100000 for the change it will be a cheap fix, what exactly is the plenum anyway?
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Old October 30th, 2006, 04:44 PM   #12
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http://www.apsprecision.com/billetplenum.html

Picture the bottom of a beerkeg style intake. This bolts to the bottom of it to seal it from the air intake area. This link is the middle level fix I suggested. It's a thicker billet plate (overpriced, but much better than the stock piece). The stock piece is probably 1/4 as thick as this plate. The stock piece gives too much and lets the gasket blow out. The Mopar intake doesn't have the plenum like this. It's all one solid piece, so it would never leak. Just up to you how much you want to spend fixing it.
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Old October 30th, 2006, 05:02 PM   #13
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that don't seem like that bad of a price, since it comes with all the gaskets, and new bolts, it's probably 50 to 60 bucks just for the gaskets
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Old October 31st, 2006, 09:58 PM   #14
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Quote:
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I dunno about plenum gaskets, but i have seen the engine sludge up enough to plug the oil return holes in the heads with high miles. after the return holes plug the valve stems are submerged in oil and can't help but burn it. I would start there first.
I was thinking along these lines as well . Does it tend to roll blue smoke if you shut if off for an hour or two then restart it ? Thats oil getting down the valve stems . That kind of miles the guides are getting loose and the valve seals are getting hardened .

Sounds like some one ran Pennzoil in it
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Old October 31st, 2006, 10:11 PM   #15
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Quote:
Originally Posted by Grandman View Post
I was thinking along these lines as well . Does it tend to roll blue smoke if you shut if off for an hour or two then restart it ? Thats oil getting down the valve stems . That kind of miles the guides are getting loose and the valve seals are getting hardened .

Sounds like some one ran Pennzoil in it
not me i hate pennsoil, i was using royal purple in it, but cant afford to feed it that every 1000 miles so now i dump the cheapest shit i can find until i get it fixed
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Old October 31st, 2006, 10:13 PM   #16
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my buddy had a 98 ram and it was burning oil like that, the valve seals were bad.
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Old October 31st, 2006, 10:17 PM   #17
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that's what i thought it was, but i'm gonna try the plenum gasket first
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Old November 1st, 2006, 01:58 PM   #18
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Don't mean to litter in this thread, but my brothers 3.9 dakota does the same thing. Do those engines have the same problems?
thanks
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Old November 1st, 2006, 02:10 PM   #19
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i'd say yes it could very well be, sounds like it's a problem for all the magnum engines, click the link that 84scrambler posted and it is listed as a repair item for them also
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Old November 21st, 2006, 10:41 AM   #20
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fixed it yesterday, could see where the plenum gasket was blown out!!
thanks for the help!!
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