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E21, E30General discussion and technical help for 1975-1991 3 series cars.
i know engines are supposed to consume a bit of oil over time. but lately, my M20 seems to be consuming a lot. today it needed a quart.
its last oil change was 1200 miles ago. before this last oil change, it needed two quarts in the 3k miles between oil changes. there is no leaking or smoking of any sort. but im gonna pull the plugs tomorrow and see how they look. hope the rings and gasket are ok.
in my last E30 i would need a quart between oil changes, but that was just before oil change time, and that engine had a leak. so what is going on here?
i guess i do drive it particularly hard. my bentley says that BMW consideres it excessive if it needs a quart every 390 miles. above that, its fine.
My car started using more as I got near 165,000 or so. After an overheat and rebuilt cylinder head, I'm not sure how it's doing cause I don't drive it much. But when it started, it was as mysterious as you seem to find yours
I'd be using a little heavier wt oil this time of year (especially if you're running non-syn) try using 10-30. A quart of non-syn in 3500 is normal. Plus you mentioned you're driving it harder that could be a contributing factor.
I used to lose about a quart per 4k in the old 325i. 5W-30 at 160k is pretty thin. A car can still burn a good amount of oil without much detection. I would concur with c1's recommendation, go to 10W-30 and see how the car adjusts to it.
ok, here they are. the number 5 spark plug smelled strongly like gas while the others were all faint, and none of them smelled like burning oil. the number 6 plug had a bunch of heavy grease around it, it was weird.
they looked fine when i had them out, but they look worse in the photos.
In person, does plug #1 look very white in comparison to plug #4?
Also, I've heard that oil (on #6) can find it's way above the spark plug. Personally, I've never had that problem, but a DIY on Pelican Parts says that it's not necessarily a huge deal.
For reference, I always use Mobil Clean 5000 (10W-40). I change my oil every 2500 - 3000 miles. My car has 146,000 miles on it and the car burns absolutely no oil, but then again, that could be an M42 thing.
Edit: Can I ask why you changed to Bosch +4 plugs?
Originally Posted by c1apton
- "The DIY Goddess" - nice job (She's "schoolin'" the boyZ)