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BMW 3-Series (E90 E92) Forum
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Engine flush
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10-16-2011, 09:32 PM | #1 |
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Engine flush
I have about 93,000 km on my E90 (~58,000 miles) and my oil change use to be about ~20,000 km (12,000 miles). After reading the forum and looking at some sludge build up in my engine, I plan to do more frequent changes (i.e. 8,000 kms).
I'm considering to do an engine flush on my next oil change. Is this recommended? I know there is a risk of failing the engine after a flush but wasn't sure if this was an old issue. |
10-16-2011, 09:37 PM | #2 |
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If you change the oil at a decent interval its not necessary..you should consider doing a manual clean of the intake valves as they are prolly caked up pretty good.
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10-17-2011, 08:07 AM | #4 |
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10-17-2011, 03:38 PM | #5 | |
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Really need to see a pic. I'm assuming you mean sludge and not varnish. You didn't say what oil you're running but Mobil 1 is typically known to clean things up. (M1 0w-40 or if you have a diesel M1 ESP 5w-30). I'd be surprised there was anything substantial. good luck. |
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10-18-2011, 09:13 AM | #6 | |
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10-19-2011, 03:11 PM | #7 | |
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10-21-2011, 09:02 PM | #9 |
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curious, what oil do you use?
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If no codes are being thrown use Chevron Techron fuel injector cleaner (concentrate). It solves rpm fluctuating upon cold start-up. Also, for most BMW problems start off by scanning your car with the Peake Research Tool. It contains the actual BMW codes. If you want to register a newly installed battery for free (just buy a $10 cable) and google/download BMWLogger
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10-22-2011, 07:34 AM | #10 | |
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10-25-2011, 07:26 PM | #11 | |
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Post #3: http://www.e90post.com/forums/showthread.php?t=601122 |
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10-26-2011, 10:52 AM | #13 | |
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10-26-2011, 11:25 AM | #15 |
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10-26-2011, 12:12 PM | #16 |
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10-26-2011, 12:14 PM | #17 |
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Not at all. There is a DIY on the pan gasket from a guy with an '07 E90, that didn't use motor flush. If you've researched enough on our car, you will see that there are several gaskets that will leak after 50K miles: Transmission, oil filter housing, etc.
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10-26-2011, 12:18 PM | #18 |
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Yes it does. You didn't check because You have to put it up on a lift to check. You also need a flash light, because its hidden underneath a bunch of stuff. I bet you any amount of money, its seeping.
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10-26-2011, 01:32 PM | #19 |
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i know you know your stuff so it's hard to say i disagree, but i have removed those fairings on the underside around 130,000 trying to find a rattling noise from a heatshield or something and while looking around didn't notice any signs of a leak around the pan. In all fairness though, i wasn't under there looking for a leak so i may have missed it, but it looked fine to me while poking around. rattling came from a bracket near the transmission in case anyone was wondering.
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10-26-2011, 02:16 PM | #20 |
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Mine's not leaking at 158,000. I have a lift and I have looked at the entire pan lip.
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10-26-2011, 02:38 PM | #21 |
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10-30-2011, 07:01 AM | #22 |
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