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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 07-20-2014, 08:53 AM
WeekendGolfer WeekendGolfer is offline
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Safe to mix Engine Oil?

Hey all,
I bought a pre-owned 2009 BMW 335i about 3 months ago and I'm not sure which oil it currently has in the engine. The light came on yesterday letting me know that it is low on oil, told me to add 1 quart. It isn't due for an oil change for another few thousand miles..I'm not sure which brand/grade to go out and purchase to put in the engine, or if it would be bad for the engine for me to mix in a different brand with what's currently in it.

anyone have any ideas? dealership is closed today and I want to get it taken care of.
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  #2  
Old 07-20-2014, 09:06 AM
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CALWATERBOY DUE CALWATERBOY DUE is offline
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Mein Auto: 09 E93 335i somewhat mod
Quote:
Originally Posted by WeekendGolfer View Post
Hey all,
I bought a pre-owned 2009 BMW 335i about 3 months ago and I'm not sure which oil it currently has in the engine. The light came on yesterday letting me know that it is low on oil, told me to add 1 quart. It isn't due for an oil change for another few thousand miles..I'm not sure which brand/grade to go out and purchase to put in the engine, or if it would be bad for the engine for me to mix in a different brand with what's currently in it.

anyone have any ideas? dealership is closed today and I want to get it taken care of.

Any BMW approved oil will work - see your Owner's Manual and visit O'Reilly's.
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  #3  
Old 07-20-2014, 09:14 AM
roadkillrob roadkillrob is offline
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Easiest approved oil to find is typically Mobil 0W40 full synthetic - walmart even has it. No worries mixing as long as you are using a BMW approved synthetic.
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  #4  
Old 07-20-2014, 02:57 PM
avocet avocet is offline
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if you are just topping off to get to your next scheduled change or are in a pinch, you can add ANY sae automotive engine oil and have NO compatibiliy issues. synth and non synth oils will blend together just fine.
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  #5  
Old 07-20-2014, 04:01 PM
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galahad05 galahad05 is offline
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Originally Posted by avocet View Post
if you are just topping off to get to your next scheduled change or are in a pinch, you can add ANY sae automotive engine oil and have NO compatibiliy issues. synth and non synth oils will blend together just fine.
In fact the owner's manual mentions this--that you can use a small amount of non-approved oil as a top off.
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Old 07-20-2014, 04:03 PM
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galahad05 galahad05 is offline
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Mein Auto: 335i sedan 6MT
For example, the 2011 335i coupe/convertible owner's manual, page 225:
"Alternative oil types
If approved oils are not available, you can use
quantities of up to 1 US quart/1 liter of another
oil with the following specifications:
API SM or higher
BMW recommends Castrol"
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  #7  
Old 07-20-2014, 04:16 PM
jamcousi9 jamcousi9 is offline
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Quote:
Originally Posted by roadkillrob View Post
Easiest approved oil to find is typically Mobil 0W40 full synthetic - walmart even has it. No worries mixing as long as you are using a BMW approved synthetic.
Aren't we supposed to run 10 weight in these cars?
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  #8  
Old 07-20-2014, 04:48 PM
Tom K. Tom K. is offline
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Quote:
Originally Posted by jamcousi9 View Post
Aren't we supposed to run 10 weight in these cars?
No. E90 OEM is 5w30 BMW branded synthetic. And Mobil 1 0w40 is also fine (but not 5w30).

Tom
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Old 07-20-2014, 05:02 PM
jamcousi9 jamcousi9 is offline
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I've heard more than once that 10 weight is better in higher (80k+) mile vehicles.. I notice the 335i tends to run a tad high in temperature so running a thicker viscosity oil would make more sense this way it stays thicker under higher temps.
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  #10  
Old 07-20-2014, 05:34 PM
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galahad05 galahad05 is offline
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0 or 10 -- that's the cold weight (viscosity).
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  #11  
Old 07-20-2014, 10:47 PM
BashedBarrique BashedBarrique is offline
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Oh, for chrissakes, the OP said he was going to change the oil in a few thousand miles and was down a quart. I would bet a kidney that adding nearly any modern multi-weight oil certified by the SAE or API for gasoline engines would have no measurable effect on wear or performance compared to the few oils consecrated by the Holy Bayerische Motoren Werke.

Unless he/she is about to attempt a land speed record or entering the Paris to Dakar Rally then they will be fine with whatever gasoline engine specified oil is on the shelf at the local parts store. Even then I doubt it would make any appreciable difference.

Last edited by BashedBarrique; 07-20-2014 at 10:48 PM.
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  #12  
Old 07-20-2014, 11:09 PM
pauljcl pauljcl is online now
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Quote:
Originally Posted by BashedBarrique View Post
Oh, for chrissakes, the OP said he was going to change the oil in a few thousand miles and was down a quart. I would bet a kidney that adding nearly any modern multi-weight oil certified by the SAE or API for gasoline engines would have no measurable effect on wear or performance compared to the few oils consecrated by the Holy Bayerische Motoren Werke.

Unless he/she is about to attempt a land speed record or entering the Paris to Dakar Rally then they will be fine with whatever gasoline engine specified oil is on the shelf at the local parts store. Even then I doubt it would make any appreciable difference.
+1, agree.
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