Marvel mystery oil in YS 91 SR

[CoronaL]

Buying a 91 SR motor that was stored in a bag and the guy put in some marvel mystery oil to "preserve" the bearings etc... I have heard you shouldn't run afterrun oil in a YS motor. Will this Marvel mystery oil fubar the diaphram of the regulator?

[DavidH]

Can MMO be used with racing fuels such as methanol?
No, MMO cannot be used in racing fuels such as methanol. Certain components of MMO are not compatible with methanol and will not mix with methanol.

http://www.marvelmysteryoil.com/index.php/site/faq/

I think MMO is petroleum based. IT will attack the material the diaphragm is made of.

David

[CoronaL]

thanks David
Looks like I'll have to pass on the deal
I appreciate your feedback

[Pinecone]

Depends on how good of deal it is.

Diaphragm is replaceable. :)