Mobil1 Formula M 5W-40 with Mobil1 0W-40
Thread Starter
Junior Member
Joined: Jul 2011
Posts: 45
Likes: 3
From: New York
2020 GLE350W4
Mobil1 Formula M 5W-40 with Mobil1 0W-40
ML 350 4MATIC 2011.
How bad idea to mix leftover 0.5 Qt of Mobil1 0W-40 with 8 Qt of Mobil1 Formula M 5W-40.
The 1 Qt of 0W-40 I have left from last Oil change. Of course I can buy 1 more Qt of Mobil1 Formula M 5W-40, but I want to know if safety for the engine. Thank you.
How bad idea to mix leftover 0.5 Qt of Mobil1 0W-40 with 8 Qt of Mobil1 Formula M 5W-40.
The 1 Qt of 0W-40 I have left from last Oil change. Of course I can buy 1 more Qt of Mobil1 Formula M 5W-40, but I want to know if safety for the engine. Thank you.
Super Member
Joined: Dec 2007
Posts: 898
Likes: 9
From: Woodstock, IL
His 2019 RAM Cummins Turbo Diesel Laramie; Her's 2007 ML320 CDI P3; Mine BMW R1200R
This a diesel? If so,
you do see the section in the owners manual and the sticker on the engine radiator support that says do not mix ANY amount of non spec oil...
The oils have 2 different Ash formulations, and your DPF will suffer premature failure. (They are still in the $3000 range)
Better to leave the 8 qts of Formula M that's in there pure, and not top it up. (Like the dealers do)
you do see the section in the owners manual and the sticker on the engine radiator support that says do not mix ANY amount of non spec oil...
The oils have 2 different Ash formulations, and your DPF will suffer premature failure. (They are still in the $3000 range)
Better to leave the 8 qts of Formula M that's in there pure, and not top it up. (Like the dealers do)
Member
Joined: Mar 2013
Posts: 142
Likes: 1
From: Braselton,GA
2008 ML320cdi Irid.silver, 2013 VW Jetta Prem. Tdi Dsg red
I assumed he had a gas engine since he didn't say Bluetec. If diesel, make sure u use the specific MB grade (229.51), at least for my 08 diesel. I only think they make 5w30 & 5w40 that I've seen in that spec. If he has a gas engine, a 1/2qt of 0w40 mixed in won't make any difference as long as the right spec oil for his engine.
Thread Starter
Junior Member
Joined: Jul 2011
Posts: 45
Likes: 3
From: New York
2020 GLE350W4
Engine type: 272,967 it is not a Diesel, it is a gas engine
MB Sheet for both oil is 229.5. The only deference is one is 0W and other is M 5W. Either oil MB approved for engine type 272. Just wanna know if any negative result may be done to engine with kind of mix.
Thank you for reply.
Thank you for reply.
