Do these two oils differ substantially ?

Joined
Aug 5, 2021
Messages
140
Location
on the road in NE Oklahoma
Mobil 1 5w-40 European formula FS /X2

vs

Mobil 1 5w-40 Formula M


The only labeling difference I see is the Formula M meets the 229.5 spec. and the other bottle doesn’t mention it.

How to find out the difference between the 229.3 and 229.5 specifications ??

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Joined
Dec 19, 2019
Messages
3,884
Location
Muncie, Indiana
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They're different oils, the Formula M is closer to a mid-SAPS oil while the FSX2 should be around 1.36% if I remember right even though it's not listed on the datasheet anymore. I doubt anything would be damaged mixing them but mixing them may result in a mixture that no longer meets the stringent requirements of MB 229.5 for extended drain intervals.
 
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