Hi,

I was wondering what oil to use and what mix to use for a BME 110
I am think ing of using Amsoil 100:1 at an 80:1 mix. What do you all think

Thanks

I think that is a good decision

Touchdown. There was a rather informative discussion on this just recently. You will find that opinions differ here.
I personally feel that running 100:1 at 80:1 is the same as running a 50:1 oil at 40:1. The amount of oil in the gas is not what's important. It's the amount of oil left in the gas after combustion that counts. (I believe)
According to the people "in the know" the 100:1 oil has a higher flash point than 50:1. What this means is that the 100:1 requires more heat to "flash" which is why you can run it at that mixture. Anything richer than 100:1 and you are defeating the purpose of the oil and you might as well just drop to the 50:1.

Now, that being said, I mix my 100:1 at 93:1. LOL

There has been much discussed about amsoil & all oils in general, I am not being argumentative just relaying what I know.

Touchdown, that being said, I would run it at 80:1 if you want to. The manufacturer instructs up to 50:1 in commercial/industrial use. It's right on the back of the bottle.

More importantly than which high quality oil you burn, is to have your engine tunned correctly AND well ventilated.

RTK. (or anybody in the know). Do you think the needle settings are more crucial on the 100:1 vs 50:1. Meaning, do you think there is more room for error on a 50:1 oil or say a 100:1 mixed at 80:1 than there is at a straight 100:1 mix?

Crash-Yes- I feel the needles are more important than the oil. If your engine is lean and not well ventilated, no matter how much oil you have you will still cook it.
I'm guessing there would be a SLIGHT increase in "room for error" @ 80:1

Put a probe on a motor and run it rich, then run it lean. You will notice a temp difference. (tried it once)

I guess you could run the same test with 100:1 and 80:1 and see exactly how much it would help.

Maybe Dick or Ralph will jump in. "The Old Guys"

Thanks RTK for responding. I should have narrowed my question to a direct comparison of 50:1 at 50:1 and 100:1 at 100:1.
I never hear anybody mixing 50:1 at 40:1 but most people running 100:1 are mixing it at a lower ratio. My only guess is that the mentality
is that mixing at 100:1 makes the engine more succeptable to damage if improperly tuned than running a 50:1 at 50:1. Maybe that mentality is correct.
I have to agree that running a 100:1 oil at 80:1 will leave more room for error. But then why not start running 50:1 at 40:1.

Why do people feel that 50:1 oil will offer more protection to an improperly tuned engine than a 100:1 mixture? Don't take this out of context. I am asking this question with sincerity.

Sorry Crash I wasn't paying close enough attention to your actual question.
I can't see how it would make enough difference to be worth while.
Most all of the big manufacturers are now recommending 100:1. They must feel there is little to no difference.