Oil change with an oil cooler

e90pilot · 05-25-2012, 06:55 PM

So I have an oil cooler now on my N52 (Stett stage 2) and I noticed there is no drain plug on the core. So, if I perform a normal oil change using the oil pan drain plug the oil in the cooler lines and core will not get drained. I asked a tech about how they do it with a stock oil cooler on the N54 and they said the procedure is the same on cars with or without the oil cooler. So the dirty oil just sits in the cooler then gets mixed with the new oil when the thermostat opens. Am I missing something? Is it really OK to have the dirty oil just mix with the new stuff? There is quite a bit of oil in this core since it's so large.

F32Fleet · 05-26-2012, 11:21 AM

Yes. The cooler doesn't hold that much to begin with. Drive more worry less.

05-25-2012, 06:55 PM	#1
e90pilot Freight Dawg 108 Rep 2,103 Posts Drives: E90 325i Join Date: Jul 2005 Location: Oakland, CA iTrader: (3)	Oil change with an oil cooler So I have an oil cooler now on my N52 (Stett stage 2) and I noticed there is no drain plug on the core. So, if I perform a normal oil change using the oil pan drain plug the oil in the cooler lines and core will not get drained. I asked a tech about how they do it with a stock oil cooler on the N54 and they said the procedure is the same on cars with or without the oil cooler. So the dirty oil just sits in the cooler then gets mixed with the new oil when the thermostat opens. Am I missing something? Is it really OK to have the dirty oil just mix with the new stuff? There is quite a bit of oil in this core since it's so large. __________________ --Marcelo '06 Arctic Metallic 325i \| Sport Package \| 6MT \| Dinan Stage III suspension \| Dinan exhaust \| 330i manifold swap! Click here! \| Active Autowerke tune \| 135i Brake Calipers \| Deiselboost caliper brackets \| E46 M3 front rotors
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05-26-2012, 11:21 AM	#2
F32Fleet Lieutenant General 3983 Rep 10,664 Posts Drives: 2015 435i Join Date: May 2005 Location: Southeastern US iTrader: (0)	Yes. The cooler doesn't hold that much to begin with. Drive more worry less.
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