Mixing oil with gas

[DCLXVI]

I've always added a small amount of oil to the fuel for some top cyl lubrication. I've never done it on a bike with FI. Does anyone think this might be a problem for the o2 sensors or should I not worry about it?

[Dave63]

Gasoline is made from oil. Marvel Mystery Oil is mostly mineral spirits, and I run that in my truck (oil/gas) religiously. Can't see it hurting the O2 sensors....

[DCLXVI]

Cool Dave. Thanks

[Nathang]

Any lubricating oil contamination of gasoline reduces it's octane rating dramatically.

Straight motor oil will run in fine a diesel, happy to ignite w/o any spark.

Adding oil to premium gas turns it into VERY cheap gas,

lower octane rating than anything you can buy in the US.

Marvel oil has a significant amount of Naphtha which is an octane booster.

If somebody gave me a drum of premium gas that had a cupful of oil added,

I would not run it in my bikes or performance cars.

Funny how much people cuss about alcohol being added to gas, but cannot resist

trying to think of something/anything else to add.

[DCLXVI]

So what your saying is that by adding oil the gasoline will ignite easier? That is what a lower octane rating will do. I don't see that as a reasonable outcome since oil is not as volatile as gasoline. I didn't think obout any change in octane rating but if anything it only makes sense that the oil would make it less likely to ignite (higher octane rating.)

[Nathang]

So what your saying is that by adding oil the gasoline will ignite easier? That is what a lower octane rating will do. I don't see that as a reasonable outcome since oil is not as volatile as gasoline.

Neither is diesel fuel.

You can drop a match into a bucket of diesel and it will get snuffed out.

Volatile must not equate to spontaneous ignition.

That takes a high Cetane rating. But you do whatever you want.

I do know for a fact certain that heavy motor oil will run great in a diesel engine.

As the fuel. No spark. Spontaneous ignition. Runs a good bit better

than pump diesel, in fact. At least the first 400 gallons has.

..And guys running supercharged and turbocharged hi performance cars

go to a lot of trouble to prevent crankcase oil vapors from recycling thru the engine

to prevent catastrophic knock.

[XDixiecratX]

Seems to me youd just be killin octane, use Seafoam and have the best of both worlds high octane and upper end lubercation.