Mixing 5w30 with 5w40?

cole92ton · 01-29-2018, 05:47 PM

I have a 2010 E92 335i, I noticed on my way to a car show yesterday that my oil level was at 3/4 (between Min and Max on the oil level scale in the BC menu) and I had checked it again farther along my trip and it read 1/2. At that point I got nervous because it was a 2 hour drive home, but on my way back I checked the level consistently and it has not gone down any more. Drove the car again today, still around the 1/2 mark.

Question:
I have some Motul 8100 5w40 laying around but my car is currently running 5w30 Genuine BMW oil. Will adding 1/4-1/2 a quart of the 5w40 hurt anything or should I steer away from mixing oil grades? (I have yet to figure out why I'm leaking or burning oil).

9krpmrx8 · 01-29-2018, 05:48 PM

It's fine.

Adieu · 01-29-2018, 05:51 PM

Add random synthetic 5w30 if you cant source BMW 5w30

GORDON.M3 · 01-29-2018, 06:44 PM

As long as its synthetic no problem.

feuer · 01-29-2018, 06:56 PM

As long as is an engine oil is ok. Any grade is better than no oil.

01-29-2018, 05:47 PM	#1
cole92ton Cole92ton 7 Rep 23 Posts Drives: 09' E92 335i Join Date: Nov 2017 Location: Orlando, FL iTrader: (0)	Mixing 5w30 with 5w40? I have a 2010 E92 335i, I noticed on my way to a car show yesterday that my oil level was at 3/4 (between Min and Max on the oil level scale in the BC menu) and I had checked it again farther along my trip and it read 1/2. At that point I got nervous because it was a 2 hour drive home, but on my way back I checked the level consistently and it has not gone down any more. Drove the car again today, still around the 1/2 mark. Question: I have some Motul 8100 5w40 laying around but my car is currently running 5w30 Genuine BMW oil. Will adding 1/4-1/2 a quart of the 5w40 hurt anything or should I steer away from mixing oil grades? (I have yet to figure out why I'm leaking or burning oil).
	Appreciate 0 Tweet Quote

01-29-2018, 05:48 PM	#2
9krpmrx8 Clean is the new cool, keep it that way. 808 Rep 1,685 Posts Drives: 11' Alpine White 335i Sedan Join Date: Jan 2016 Location: San Antonio, Texas iTrader: (0)	It's fine.
	Appreciate 0 Quote

01-29-2018, 05:51 PM	#3
Adieu First Lieutenant 73 Rep 349 Posts Drives: 335d Join Date: Jun 2016 Location: socal iTrader: (0)	Add random synthetic 5w30 if you cant source BMW 5w30
	Appreciate 0 Quote

01-29-2018, 06:44 PM	#4
GORDON.M3 Brigadier General 1423 Rep 3,001 Posts Drives: E92 M3 • F25 X3 M-Sport Join Date: Dec 2013 Location: LAX/YYZ/NRT iTrader: (11)	As long as its synthetic no problem. __________________ INSTAGRAM: GORDON.M3 North American Mr12Volt Carplay/Android Auto Distributor DINAN \| EVOSPORT \| VAC \| ARP \| RD SPORT \| NEEZ \| EIBACH \| CSF \| IND \| BILSTEIN \| KLASSEN \| BREMBO \| ENDLESS \| BBS \| BPM SPORT \| PROJECT MU \| EVENTURI
	Appreciate 0 Quote

01-29-2018, 06:56 PM	#5
feuer Major General 4276 Rep 9,206 Posts Drives: wife crazy! Join Date: Apr 2015 Location: Chicago, IL iTrader: (5)	As long as is an engine oil is ok. Any grade is better than no oil.
	Appreciate 2 9krpmrx8808.00 Quote