oil dilution

[347stroker]

Change it before you run it. Gasoline will mix with the oil and thin it out. Tom

[blykins]

Change it....

[patrickt]

Hmmm, if you have a jar full of motor oil, and you pour in half again of gas, will they mix or separate?

[blykins]

Doesn't matter......an oil pump will pump it all and then you get etched bearings and washed down cylinders.

[patrickt]

Originally Posted by blykins

Doesn't matter......an oil pump will pump it all and then you get etched bearings and washed down cylinders.

That's no answer. Do you know whether it will mix or separate? And if it separates, which goes to the top? Of course you do know that it is not unusual to have the presence of fuel in your oil analysis. Levels of 2%, according to my Blackstone reports, are not considered out of the ordinary.

[olddog]

Originally Posted by patrickt

That's no answer. Do you know whether it will mix or separate? And if it separates, which goes to the top? Of course you do know that it is not unusual to have the presence of fuel in your oil analysis. Levels of 2%, according to my Blackstone reports, are not considered out of the ordinary.

Here is your answer. Yes oil and gasoline mix and do not separate. We do it all the time for the old 2 cycle engines.

My son built a SBC. The new mechanical fuel pump had a hole in the diaphragm, unbeknownst to him. After the normal start up set timing, etc. it started to knock at idle. He called me to come listen to it. Car had an idiot light and it never came on. I said check the oil. He said I just poured 5 quarts in, I know it is right. I said humor me, I'm old. He pulled the dipstick out and it was about 4 quarts over, thin as water, and smelled like gasoline.

Bottom line it was well mixed and never separated, when the engine was pulled apart a week later.

[patrickt]

Originally Posted by olddog

Bottom line it was well mixed and never separated, when the engine was pulled apart a week later.

Good nugget of info that I did not know. Thanks.

[FWB]

check the damn dipstick.....is the level considerably higher?
if no then the amount of fuel in there is insignificant. run it warm for a half hour or so and it will have turned to a gas(fumes) and have been purged by the breather or PCV

i see alot of folks here thinking they are ken miles doing racing research. its a street motor for gods sake.

[patrickt]

Or just use the old "match stick" test. Wave the lit match at the top of the open dipstick tube and, if nothing untoward occurs, you're good to go....