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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > Using ATF and thin oil to flush engine???



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      06-10-2012, 08:26 AM   #1
armani12
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Using ATF and thin oil to flush engine???

Hi guys,

I have researched a bit about this topic outside the forums, and many people claim that using maybe 1 or 1/2 a quart of atf combined with thin oil can clean any deposits and possibly slush that has accumulated in the engine. Has anyone done this? What exactly will be a thin oil? A 0w20 maybe? Im only planning on using this to flush it, so I'll run the can with this combination of oil and/or atf for 10 minutes or 3-5 miles maybe and then flush it out right away and fill the engine with the regular 0w40 mobil1 (the one i've been using).
Do you think there is a risk of something happening? Not worth the money?

My car has 50800 miles and the engine is a n54.
I changed the oil myself at 45k and the dealer changed it at 40k and before that it had its 15k intervals. The oil comes a bit dirty, so i dont know if this will hurt in any way. Thank you in advance and sorry for any writing mistakes as i'm in my iphone
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      06-10-2012, 09:15 AM   #2
Chriztofor
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I wouldn't do that. Maybe change the oil at an earlier interval, ie 10,000 miles. I purchased my car used @ 49,000 miles so I used seafoam once. Dumped 1/2 of the bottle in the oil and the rest in the gas tank. At 100 miles I changed the oil. Mixed reviews on here so I didnt do that again. Car now has 83,000 miles and running sssssmmmmoooottthhhh. Let us know what you ultimately decide to do and most importantly, keep us posted! Good luck.
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