would MMO evaporate from crankcase?

[friendly_jacek]

the reason I ask I used ~400cc MMO in the last 700 miles of OCI in my corolla and ~400cc disappeared before oil change. Not sure if I should count it toward oil consumption vs. evaporation.

Up to that the engine consumed ~500cc in the prior 2300 miles.

 

[CourierDriver]

In the past when I used one qt of mmo and 4 qts of M1, my oil level went down a half qt around 15oo miles, then I topped it off with M1 and it never changed after that, go figure,,dont know where it went.

 

[bepperb]

The main ingredient is stoddard solvent which is a spirit and will evaporate pretty quickly.

 

[electrolover]

well if nothing else the mmo will hurt the oil's resistance to burn off. so maybe its just consumption because of the mix. i dont think it will evaporate from the oil once mixed,

 

[sangyup81]

that always happens to me too
just top off with regular oil

 

[friendly_jacek]

Originally Posted By: bepperb
The main ingredient is stoddard solvent which is a spirit and will evaporate pretty quickly.


Quote:
MMO MSDS says:

Naphthenic Hydrocarbons 70-80%
Mineral Spirits 20-30%
Chlorinated Hydrocarbons 0-1%


If so, then 30% should evaporate, the rest burns?

 

[friendly_jacek]

Beeing a curious person, I googled for naphthenic and found this description from http://www.freepatentsonline.com/4515680.html

Quote:
Historically, naphthenic lubricating oils have been the lubricating oils of choice on a cost/performance basis. This has been particularly the case in formulating highly viscous oils used in heavy duty applications such as railroad and marine diesel engines. It has been the experience in the art that the naphthenic lubricating oils have the capability of dissolving and/or softening significant quantities of the semi-solid carbonacous decomposition products which form in crank cases under severe operating conditions. The semi-solid carbonacous components formed on the cylinder walls and suspended in naphthenic lubricating oil in the crank cases of diesel engines tend to be softer than the corresponding carbonacous products formed in paraffinic lubrication oils under identical operating conditions. By reason of their softer nature, the deposites formed from naphthenic lubricating oils cause less wear on moving engine parts. It is the belief in the art that diesel engines have a longer operating life when lubricated with naphthenic lubricants than is the case with paraffinic lubricants. Specifically, it is believed that the incidence of piston ring breakage is lower when naphthenic lubricating oils are employed.

By a quirk of nature, naturally occurring crude oil containing significant fractions of naphthenic hydrocarbons in the lubricating oil range are found largely within the continental United States and Venezuela. Crude oils produced in other oil producing areas of the world have relatively lower concentrations of such naphthenic hydrocarbons. Accordingly, as the worldwide demand for naphthenic lubricating oils is increasing, the available supply of crude oils containing significant concentrations of the desired naphthenic hydrocarbons is decreasing. It is thus seen that a shortage of naphthenic lubricating oils is developing.


Well, that would explain why MMO cleans and is harmless in the crankcase (after that solvent evaporation).

 

[demarpaint]

Nice info ^^^^. Some cars use a bit of oil when adding MMO, at least in my experience with the product. Just top up with oil, nothing to be worried about. Your engine will be cleaner as a result.

 

[spasm3]

Thats why you want to add mmo to a cold engine for the best cleaning.

 

[steve20]

In almost 40 years of using MMO in countless different engines, from Indiana, to Florida, to Maine I have never, not once, had to add oil due to MMO burnoff

 

[demarpaint]

Originally Posted By: spasm3
Thats why you want to add mmo to a cold engine for the best cleaning.


Makes no difference when you add it, hot or cold engine. At least from my experience, and I've been using it since the 70's. Products like STP are best added to a warm engine, but that's another topic.

 

[PontiacFan]

Originally Posted By: steve20
In almost 40 years of using MMO in countless different engines, from Indiana, to Florida, to Maine I have never, not once, had to add oil due to MMO burnoff


40 years of using MMO, that says alot about this product.

 

[1WildPig]

I put 1/2 qt of MMO in with 4.5 qts of oil at oil change time in our 97 Ranger with a 4.0 engine that uses no oil - after 500 miles, it was 1/2 qt low - added 1/2 qt of oil and it has remained full since ... it seems that some motors will have burn off and some won't ... may depend on the weight of oil it's mixed with and the type of use of the motor ???

 

[friendly_jacek]

Based on the MSDS, the light solvents will evaporate, no question about it. The question is whether the naphthenic oil will also evaporate. I'm thinking that in some hot-running engines it's a possibility. MMO is not tested for NOACK volatily. I'm sure it's huge.