POPGUN said: (quoted from post at 21:37:21 11/13/13) I read a post on oil and MMO and one reply said get that crap out of your tractor. Why? It is a wonderful product. I have never heard a harsh word about before now. Ny daughter in laws brother is petro engineer and said it is about 80% mineral oil and stoddard solvent. I use it in gas and crank case.It smells sweet like aircraft hyd. fluid .
That was my quote.
MMO is 20% Stoddard solvent mixed with 80% light napthenic base mineral oil and contains a mild EP anti-wear additive package. It also contains oil of wintergreen to make it smell nice and red dye to make it look pretty. It has a viscosity of 2.6 cSt @100C. To put that in perspective here are the MINIMUM viscosities for the various grades of engine oil:
SAE 0W - 3.8 cSt
SAE 5W - 3.8 cSt
SAE 10W - 4.1 cSt
SAE 20W - 5.6 cSt
SAE 25W - 9.3 cSt
SAE 20 - 5.6 cSt
SAE 30 - 9.3 cSt
SAE 40 - 12.5 cSt
SAE 50 - 16.3 cSt
As you can see MMO is lighter than the lightest grade of engine oil the SAE has defined and that should tell you something about it's suitability as an engine lubricant. In smaller quantities MMO in the crankcase is probably harmless but mixed 5:1 it reduces the viscosity of your engine oil by a full grade or more. Do you think that is a good or bad thing? Ask your daughter in law's petro engineer brother if he thinks it is a good or bad thing. Ask him if he makes it a practice to use an oil in his $30K personal automobile that is a grade (or more) lighter than what the owner's manual says to use.
I am not a petro engineer but I KNOW that using an oil that is a grade (or more) lighter than the OEM recommended grade will:
Reduce the oil film thickness inside your engine's main, rod, and camshaft bearings.
Expose your engine to increased bearing wear
And ultimately it will shorten the engine life
MMO in the crankcase serves little if any useful purpose and in those proportions almost surely does more damage than good.
TOH[u:f7eaac69f4][/u:f7eaac69f4]
This post was edited by TheOldHokie at 18:32:43 11/13/13 2 times.
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