Can I mix oil on my 2011 F10 N55?

fcorey · 03-16-2021, 04:40 PM

Hi Guys,
I live on a Caribbean island and ordered a 5 quart jug of Mobil 1 0W-40 European car Oil from Amazon for my 2011 535i F10 N55 for an oil change I just did.

Turns out I'm one quart short and cannot find the same oil on the island. I found Castrol 0W-20 on island. If I were to add a quart of the castrol 0W-20 to the existing 5 quarts of Mobil 1 0W-40 would I be t possibly doing any damage to the engine?
Thanks for your help in advance!

SWFLf10 · 03-16-2021, 07:23 PM

I've always heard it's best not to mix brands because of different additives in each brand not mixing well. And I've heard mixing different weights is fine.

Unspec · 03-16-2021, 07:37 PM

As long as they both meet BMW LL-01 spec, you'll be fine.

Quote:

Originally Posted by SWFLf10

I've always heard it's best not to mix brands because of different additives in each brand not mixing well. And I've heard mixing different weights is fine.

Urban myth. If this were true, you'd never be able to change oil brands other than OEM without an engine flush or something.

chipguy · 03-16-2021, 08:49 PM

0w-20 is too thin, especially for your climate. LL-01 is the best but at least A3/B4.

SWFLf10 · 03-17-2021, 04:03 AM

Quote:

Originally Posted by Unspec

As long as they both meet BMW LL-01 spec, you'll be fine.

Quote:

Originally Posted by SWFLf10

I've always heard it's best not to mix brands because of different additives in each brand not mixing well. And I've heard mixing different weights is fine.

Urban myth. If this were true, you'd never be able to change oil brands other than OEM without an engine flush or something.

That makes sense. Didn't think about that.

TEF · 03-19-2021, 04:03 PM

While this is just an observation, I don't think that any Mobil 1 oils meets LL-01 specs. I am pretty sure that Castrol and Pennzoil do offer oils that do.

AnotherM · 03-19-2021, 07:08 PM

I would grab a quart of 5w30 over 0w20.

It is only going to be 16% of the oil in your car so it really shouldn't make a huge difference, but w20 is very thin.

03-16-2021, 04:40 PM	#1
fcorey New Member 1 Rep 8 Posts Drives: 2011 535i F10 N55 (RH Drive) Join Date: Feb 2021 Location: Grand Cayman iTrader: (0)	Can I mix oil on my 2011 F10 N55? Hi Guys, I live on a Caribbean island and ordered a 5 quart jug of Mobil 1 0W-40 European car Oil from Amazon for my 2011 535i F10 N55 for an oil change I just did. Turns out I'm one quart short and cannot find the same oil on the island. I found Castrol 0W-20 on island. If I were to add a quart of the castrol 0W-20 to the existing 5 quarts of Mobil 1 0W-40 would I be t possibly doing any damage to the engine? Thanks for your help in advance!
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03-16-2021, 07:23 PM	#2
SWFLf10 Captain 374 Rep 639 Posts Drives: 2016 Alpina B6, 2015 535i Join Date: Jun 2018 Location: Florida iTrader: (0) Garage List 2016 BMW Alpina B6 ... [10.00] 2015 BMW 535i [8.83]	I've always heard it's best not to mix brands because of different additives in each brand not mixing well. And I've heard mixing different weights is fine.
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03-16-2021, 08:49 PM	#4
chipguy Private First Class 39 Rep 110 Posts Drives: 12 528i Join Date: Feb 2019 Location: san jose, ca iTrader: (0)	0w-20 is too thin, especially for your climate. LL-01 is the best but at least A3/B4.
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03-19-2021, 04:03 PM	#6
TEF First Lieutenant 111 Rep 377 Posts Drives: 16 X3 28d/18 540d xdrive Join Date: Jun 2017 Location: Western PA iTrader: (0) Garage List 2018 540d xdrive [0.00] 2018 540d xdrive [0.00] 2016 X3 28d [0.00]	While this is just an observation, I don't think that any Mobil 1 oils meets LL-01 specs. I am pretty sure that Castrol and Pennzoil do offer oils that do.
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03-19-2021, 07:08 PM	#7
AnotherM Cole 321 Rep 498 Posts Drives: 2016 m5 CP Join Date: Oct 2020 Location: AZ iTrader: (0)	I would grab a quart of 5w30 over 0w20. It is only going to be 16% of the oil in your car so it really shouldn't make a huge difference, but w20 is very thin.
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