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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 12-08-2009, 06:21 AM   #1 (permalink)
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oil in air intake..

i pulled out my air box today to work on the alternator and noticed that the inside walls of the intake piping were oil coated. I am talking about between the air flow meter and up into the throttle body. What could be causing this.
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Old 12-08-2009, 06:29 AM   #2 (permalink)
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That will be caused by the OSV, only replace with genuine from BMW, it will also take a while after fitting the new one for all remaining oil in the intake system to go.
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Old 12-08-2009, 07:37 AM   #3 (permalink)
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Could also be from any previous owner over oiling an aftermarket air filter.
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Old 12-08-2009, 08:58 AM   #4 (permalink)
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Blow by, all high mileage engines will do this over time...all of my M20s had some level of blow by..It's just oil getting past the piston rings cause they are worn out.
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Old 12-08-2009, 02:19 PM   #5 (permalink)
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ok i wiped it with a rag so will see if it comes back. I replace the osv, where is it located and the engine has done 129 thousand k's so not too high mileage
i searched the internet and found this link
E30 oil all inside intake
which gives a few ideas ..about oil drains being restricted i guess it means the oil drains under the valve cover?
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Old 12-08-2009, 08:48 PM   #6 (permalink)
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what model and how many miles are on your E30?
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Old 12-08-2009, 10:17 PM   #7 (permalink)
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its an e30 320i 1990 with 129000 km which is (80156 miles)
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Old 12-09-2009, 08:58 AM   #8 (permalink)
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wow that is mind bogglingly low mileage! My E30 just rolled over 375,000 miles!
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Old 12-09-2009, 09:02 AM   #9 (permalink)
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Kyle wheni bought my BAUR it only had 67,xxx miles
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Old 12-09-2009, 10:21 PM   #10 (permalink)
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epicfail for selling it then lol
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Old 12-10-2009, 12:26 AM   #11 (permalink)
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epicfail denied. by the time i landed after being paid to deliver the car to Oregon, it was already in the shop getting a frame off resto.
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Old 12-22-2009, 12:42 PM   #12 (permalink)
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I had my 85 325 E given to me with 60,xxx miles on it... didnt have a problem with it for the first year and then all of sudden stuff is die off on me...recently replaced my clutch...that was fun...NOT
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Old 12-22-2009, 07:09 PM   #13 (permalink)
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clutch in an E30 is probably one of the easiest jobs i have ever done lol, try doing it on ANY front wheel drive or all wheel drive cars lol
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Old 01-08-2010, 03:30 PM   #14 (permalink)
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hi, took my intake off again the other day and yes there is another light surface of oil in there. With all these different opinions i dont know where to start..
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Old 01-08-2010, 03:54 PM   #15 (permalink)
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Originally Posted by tim96 View Post
hi, took my intake off again the other day and yes there is another light surface of oil in there. With all these different opinions i dont know where to start..

If I were in your shoes, I would do a compression test on all cylinders........to eliminate the worst case scenario!



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