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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 06-19-2014, 02:38 PM
EnjoyDrivingMN EnjoyDrivingMN is offline
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Simple Oil Change Question

I am about to change my oil this weekend. And as I read the oil changing procedures on here, a lot recommend to completely warm up the car by running a 5-10 minutes. Is that necessary? I usually change the oil on a cold engine, thinking that the shaves and waste would have settled in the bottom and drained out easier.

Any input would be highly appreciated
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  #2  
Old 06-19-2014, 02:58 PM
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BostonB6 BostonB6 is offline
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Oil should be warm so that and particulates that would settle to the bottom of the engine are circulated and held in suspension. Also the oil will flow out better.
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Old 06-19-2014, 02:59 PM
Anionweed Anionweed is offline
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I believe the reason you warm up the "oil" is so that it flows better (more old oil will come out in less time). Shaving are also more likely to flow out with the warmed up oil.
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Old 06-19-2014, 03:00 PM
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Zooks527 Zooks527 is offline
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Yeah, they settle, but cold oil doesn't flow as easily, so the thinking is that it will just leave them in the bottom of the pan. Warm oil flows out at a much higher rate.
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Old 06-19-2014, 03:02 PM
v8power v8power is offline
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I do it when its cold. All the oil has drain down to the pan to get most of the old oil out. When you start it up, you're kicking up the old oil again to the top. However , this is subjective to each individual. Plus I dont want to burn my hands with the hot oil jizzling out when you remove the drain bolt.
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Old 06-19-2014, 03:17 PM
hondo402000 hondo402000 is online now
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to each his own, I drain my oil after I have driven the car home from the dealer picking up oil and wear the heavy duty rubber gloves so I don't burn my fingers
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Old 06-19-2014, 03:33 PM
Anionweed Anionweed is offline
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I buy the filter from Classic BMW in Plano and the oil from Autozone, but I do make sure to get the 5w30 "German" oil.
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Old 06-19-2014, 04:14 PM
z28forlife z28forlife is offline
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Either way is fine.
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Old 06-19-2014, 06:36 PM
Ilovemycar Ilovemycar is offline
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Just my 2 cents, but even with raggedly old dishwash gloves, does the oil feel only "very warm" at about 10 minutes or so after the oil temp hit 200 or just barely past.
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Old 06-20-2014, 12:20 AM
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sptt144 sptt144 is offline
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Warming it up just helps it to flow faster since its thinner and not stick to as many parts as possible. You want it all out! Think about that maple syrup. Nice and thick, sticks to the inside of the bottle better. Warm it up and it comes out quick and still tastes great!
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Old 06-20-2014, 09:54 AM
EnjoyDrivingMN EnjoyDrivingMN is offline
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Thanks for the input, guys!! I guess there are pro/con in each of the ways, so I decide to do them one at another time. 1 warm-up , 1 cold, etc... hahaha
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Old 06-21-2014, 10:06 AM
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Dave 20T Dave 20T is offline
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I've done it many ways.

Completely hot after driving 30 miles.
Completely cold.
A little warm by driving 2 miles.

#2 is easiest. If you are at home, you might be able to wait an hour and let all the old oil drip.

#3 is a compromise. The oil is warm but you will not get burned touching anything, except the exhaust. That will be hot.
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