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Old 06-22-2015, 07:38 AM   #1
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Slight oil leak...Issue or non Issue?

Well I have a new to me 04 Mountain Aire with the ISL 400.. I have been noticing the few times I have done my. Walk around that I have a slight ( drips)oil leak.. If I park it over night I get about a 2" round stain on the ground..He engine looks perfectly clean..The only place I see any oil residue is at the back of the pan between the engine and transmission.. And even there I only see a drip hanging from a bundle of wires.. It could be the slobber tube since it also looks a little wet.. Wondering if the turbulence under the coach is somehow pushing the oil mist forward??. Are minor oil leaks an Issue or the nature of the beast?


Thoughts opinions..Thanks in advance
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Old 06-22-2015, 07:45 AM   #2
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Put a extension hose on the slobber tube. And then watch where the leak changes or not.

In the mean time check the oil stick every 1K miles for being low.
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Old 06-22-2015, 08:53 AM   #3
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I kind of went through the same thing with my 2002 Windsor. The engine and oil pan were covered in oil. I bought a couple of cans of the Gunk engine cleaner and sprayed, brushed, and hosed off the lower part of the engine a couple of times until it was pretty clean.

I then put a catch bottle on the slobber tube to see if there was another source of the oil. I found a bottle that had a very tight fit over the slobber tube, drilled some holes around the top for the exhaust to excape, slipped it over the slobber tube and then drilled a hole through the top of the bottle and slobber tube and used a clip pin to hold it in place. Over time the engine stayed pretty clean. The bottle did catch oil and has some developing around the breather holes but the oil was not getting on the engine.

I did notice a couple of bolts on the oil an with a drip developing around them so I retorqued the and that solved that problem.
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Old 08-26-2015, 10:07 PM   #4
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Could be a slight leak in the oil pan gasket. Had mine replaced and it took care of my leak. If it continues it can cause clogged radiator fins. Slobber tube needs to exhaust well to the rear to keep oil mist from being pushed thur the radiator.


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Old 09-02-2015, 07:40 PM   #5
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Leaking oil..could be this??

I also had a leak going on 3 years now from our 400 Cummins, about the size of a salad plate when I park....the service tecs said it was a bad drain plug since that is where the dripping happened. I finally gave up and did my own chassis lube....found out:
1) missing grease zerk in u-joint

2)grease zerks in drive line area were mostly dry and unattended

3)after cleaning the sludge off the oil pan, then warming up the motor for 15 minutes the oil drip was caused by a crack in the oil pan running from the drain bolt to the pan gasket. Cummins said over tightening caused it...

Do your self a favor and crawl under your rig and inspect it after a service to make sure things you pay for are getting done. I have had service done by RV-service dealers, freightliner service centers and various diesel service plazas.

Beware if crappy service!!!

Good luck in your travels!

Dave and Dayna
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Old 09-02-2015, 09:26 PM   #6
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Thanks guys... I located the oil leak..all the bolts noise isolators were deteriorated... Had to replace them one by one..A total of 32 at $16 a piece... Yes ...a bolt with a rubber isolator( washer) $16.. All fixed.. No more oil leak..
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Old 09-03-2015, 08:17 AM   #7
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I was going to say my 8.1 L Vortec Gasser usually burned less than one quart of oil per year (For like 9 years) unless I go mountaineering then it's one quart of oil per mountain (Ok that's very hard driving so I forgive it)

Well about 13 months ago I checked the oil (Down about a cup or less) and drove 200 miles on relatively flat land (The first mile was a bit hilly but after that it was kind of like driving around a pool table that was slightly slanted down hill) Parked for a month and when I went to leave LOW OIL

Added all I had and less than 100 miles later LOW OIL BOOM (thrown rod)

So here I sit broken rodded, ran out of oil before it started.

(Man was that a re-write of an old joke... And a serious laundry job too).

Just a slight oil leak.. If I get the engine out and post-mortumed within 3 years and they find road hazard Insurance pays.
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