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Old 01-07-2006, 08:04 PM   #1
TTM3
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Too Much Oil, Too much Gas

I have an E36 1997 M3. It is burning way too much engine oil and my gas consumption is terrible. I change the engine oil and filter every 5000 km, I do not beat the car up - I am very kind to it, and I currently use a Moble 1 15W50 engine oil. I recently changed the spark plugs to Boch platniums. The old plugs had normal wear and there was no oil in the spark plug holes. I also use premium gas. I would appreciate any suggestions on how to improve my gas and oil consumption.
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Old 01-07-2006, 08:25 PM   #2
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15W50 is WAAAAY to heavy for cold weather, try 5W30 or 0W30 instead, see if that improved your situation.

That heavy oil has the consistancy of molassas in negative temperatures. It's a good way to ruin your oil pump or oil seals.
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Old 01-07-2006, 08:33 PM   #3
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how much is your oil consumption ?
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Old 01-07-2006, 08:36 PM   #4
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How much KM do you get on a full tank?
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Old 01-07-2006, 08:38 PM   #5
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Look who it is..
Welcome Tim.
Im sure someone will help u with ur problem
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Old 01-07-2006, 09:48 PM   #6
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My consumptions are not exact here, but I would have to say 215km/tank and maybe a L of oil every couple of weeks. I have noticed oil residue on the inside of my tail pipe. Thanks Zimmie!
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Old 01-07-2006, 09:49 PM   #7
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What kind of engine oil does everyone use?!
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Old 01-08-2006, 01:07 AM   #8
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I use voll synthese 5W30. Castrol 5W30 is nearly as good and MUCH cheaper. A litre every few weeks? even with your engine not running well (its not) this may (probably is) an oil leak. Your CEL on? o2 sensors could be gone. (bad fuel consumption)

there's a million more things that could be wrong, these are the first two that popped into my head.
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Old 01-08-2006, 02:55 AM   #9
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OUCH.... 215km/tank that is HORRIBLE, even for an M!
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Old 01-08-2006, 12:24 PM   #10
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Quote:
Originally Posted by Soldo
OUCH.... 215km/tank that is HORRIBLE, even for an M!
No kidding. I've got the same car and I'm getting about 500km/tank.

Nelson: I'm still running 15W50 (gonna swap it out soon for the winter) and I don't this is causing his poor mileage and oil burning. If anything, the thicker oil should actually burn less (hence why I use it at the track).

TTM3: Is you CEL (Check Engine Light) on? Does it even work? (it should light up briefely when you turn the key to the 'on' position) Is the engine running smooth and strong? Do you have an above average amount of smoke coming from the tailpipe when you hammer the throttle? Finally, does the oil smell excessively like raw gasoline? ...does anyone see where I'm going with this...

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Old 01-08-2006, 12:40 PM   #11
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yeah ///MP the car is probably running very rich. New o2 sensors would prolly fix this
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Old 01-08-2006, 04:10 PM   #12
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Quote:
Originally Posted by thinair
15W50 is WAAAAY to heavy for cold weather, try 5W30 or 0W30 instead, see if that improved your situation.

That heavy oil has the consistancy of molassas in negative temperatures. It's a good way to ruin your oil pump or oil seals.
Mobil 1 15w50 has the same pouring rate at -45c as any conventianal 5w30 oil
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Old 01-08-2006, 06:24 PM   #13
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Unless you're driving like 2000km a week then a litre of oil every week is too much. I'd say there is something else going on there.
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Old 01-08-2006, 06:53 PM   #14
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Quote:
Originally Posted by ///MP
Nelson: I'm still running 15W50 (gonna swap it out soon for the winter) and I don't this is causing his poor mileage and oil burning. If anything, the thicker oil should actually burn less (hence why I use it at the track).
MP
It's not causing it directly, but if you blow an oil seal due to increased pressure could be causing the oil to be going somewhere where it shouldn't.

Quote:
Originally Posted by yellow_blur
Mobil 1 15w50 has the same pouring rate at -45c as any conventianal 5w30 oil
It pours, but ever so slowly. No one will recommend you to run 15W50 in negative temperatures, not even Mobil themselves.
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Old 01-08-2006, 10:48 PM   #15
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Thanks to everyone who has replied! I do not have an oil leak. I have not noticed excess smoke when I hammer the throttle. The engine check light is not on. When I have left it sit for a few hours then I start the car it sounds rough, but when it warms up it sounds smooth and strong. It responds well when I need the power. And I will have to check the oil to see if it smells like raw gasoline. It sounds like I have to change the type of oil that I am using, maybe to 5W30?
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