MS462

[Evansaw]

Yes it is available. Under a different method of octane rating.

87 Octane US = 91 Octane EU.
91 Octane US = 95 Octane EU
93 US = 98 EU
and so on.....

US fuels are not rated using RON. They use Pump Octane as the rating.

Good to know. Useful

 

[Evansaw]

You should read some of the threads on this site. Some people have done some very extensive testing. Specific to chainsaws

Main reason to join forum is to learn. I ll have a look on fuel threads

 

[MustangMike]

Since we are running two strokes, and mix oil in the gas for fuel, we are dealing with two different and separate things.

The Octane rating is simply the temp at which it takes to ignite fuel. A high compression 4 stroke engine requires high octane fuel, or there will be pre ignition. The only reason high octane gas can provide more power is due to the higher engine compression, not more energy in the fuel.

Then you have the Cetane rating, or burn rate. This measure is typically used to rate diesel fuel. Adding more oil to the gas will lower the Octane rating, but raise the Cetane rating. Combine this with the high RPMs of a 2 stroke motor, and Octane rating becomes less relevant.

That said, I run 93 octane in my saws. It likely provides less power than 87 octane gas, but the higher octane runs cooler and will help your saw last longer. I think this is especially important when I mill.

I believe running a good 2 stroke oil at higher than 50:1 is the most important factor, and almost any fresh fuel will be OK in your saw if you do this.

 

[frank rizzo]

Since we are running two strokes, and mix oil in the gas for fuel, we are dealing with two different and separate things.

The Octane rating is simply the temp at which it takes to ignite fuel. A high compression 4 stroke engine requires high octane fuel, or there will be pre ignition. The only reason high octane gas can provide more power is due to the higher engine compression, not more energy in the fuel.

Then you have the Cetane rating, or burn rate. This measure is typically used to rate diesel fuel. Adding more oil to the gas will lower the Octane rating, but raise the Cetane rating. Combine this with the high RPMs of a 2 stroke motor, and Octane rating becomes less relevant.

That said, I run 93 octane in my saws. It likely provides less power than 87 octane gas, but the higher octane runs cooler and will help your saw last longer. I think this is especially important when I mill.

I believe running a good 2 stroke oil at higher than 50:1 is the most important factor, and almost any fresh fuel will be OK in your saw if you do this.

In the STIHL owners manual it recommends a minimum 89 octane fuel with no more than 10% ethanol - trouble is , when buying said fuel how do we know for certain it doesn’t contain 13% ethanol ; 16% ethanol; 20% ethanol ? The correct answer is we do not ... If you are going to mix your own non-ethanol 91 and a good mix oil at 50:1 has worked well

 

[T.Roller]

In the STIHL owners manual it recommends a minimum 89 octane fuel with no more than 10% ethanol - trouble is , when buying said fuel how do we know for certain it doesn’t contain 13% ethanol ; 16% ethanol; 20% ethanol ? The correct answer is we do not ... If you are going to mix your own non-ethanol 91 and a good mix oil at 50:1 has worked well

They make very inexpensive ethanol testers

 

[Stihl working Hard]

It's worth it for the extra warranty for sure. As long as it stays stock haha

Stock saw Dave

 

[Evansaw]

In the STIHL owners manual it recommends a minimum 89 octane fuel with no more than 10% ethanol - trouble is , when buying said fuel how do we know for certain it doesn’t contain 13% ethanol ; 16% ethanol; 20% ethanol ? The correct answer is we do not ... If you are going to mix your own non-ethanol 91 and a good mix oil at 50:1 has worked well

Another good reply leading towards better octane since we are not sure of exact fuel quality

 

[Stihl working Hard]

You don't need no stinking warranty.

Stihl warranty isn’t worth the paper it’s written on

 

[Evansaw]

Stihl warranty isn’t worth the paper it’s written on

I have to admit that couple months ago got problem with my 661oil pump. They just replaced it, no question asked, free of charge.

 

[GCJenks204]

Stihl warranty isn’t worth the paper it’s written on

I have to admit that couple months ago got problem with my 661oil pump. They just replaced it, no question asked, free of charge.

Warranty is at the descretion of the dealer more than anything. If a dealer wants to cover your issue they will find a way too. Just last week my dealer was telling me about the hassle of getting warranty on a BR700 blower. He wasn't the original seller of the blower even and realized the blower was registered as "Construction" with only a 90day warranty. He knew it was home owner use and fought with Stihl to change the status in the system and cover the repairs. Had to have a Stihl Reginal Tech approve it in person but managed to get it done.

 

[Stihl working Hard]

You should try 87 octane, ethanol free. You just might be surprised.

Oh, and chit can the stihl oil.

Couldn’t agree more

 

[Evansaw]

Warranty is at the descretion of the dealer more than anything. If a dealer wants to cover your issue they will find a way too. Just last week my dealer was telling me about the hassle of getting warranty on a BR700 blower. He wasn't the original seller of the blower even and realized the blower was registered as "Construction" with only a 90day warranty. He knew it was home owner use and fought with Stihl to change the status in the system and cover the repairs. Had to have a Stihl Reginal Tech approve it in person but managed to get it done.

Many disadvantages in my country but STIHL’s presence is very high valued. They honor the brand! Haven’t any problems and the last years that I changed everything to M tronic they are even better.

Month ago or so bought the 261cm v2
Accidentally wrote in paper 260. I called to mention my MISTAKE after couple days and they even sent me a t-shirt free.
I told them i sold the 260 i had and never want to hear about it but still haunts me!!! Lol

 

[Stihl working Hard]

I have to admit that couple months ago got problem with my 661oil pump. They just replaced it, no question asked, free of charge.

I know people that have had seizures on the early released saws pushing chit up hill with a teaspoon for warranty on it claiming wrong oil and the likes

 

[Stihl working Hard]

I run 93 e free

Same here 93 40:1 no issues

 

[Evansaw]

I know people that have had seizures on the early released saws pushing chit up hill with a teaspoon for warranty on it claiming wrong oil and the likes

Mine is 2016 model

 

[frank rizzo]

They make very inexpensive ethanol testers

Yes they do ... so after “testing” you determine your fuel is 14% ethanol instead of the 10% that it states on the pump ... now what ?

 

[Evansaw]

Yes they do ... so after “testing” you determine your fuel is 14% ethanol instead of the 10% that it states on the pump ... now what ?

Call nearest Motomix dealer...lol

This is the real scenario. You find after you pay. Unfortunately.

 

[frank rizzo]

Call nearest Motomix dealer...lol

This is the real scenario. You find after you pay. Unfortunately.

Yeppers ... and your saw won’t likey that fuel for long especially if ported ! Seems a bit foolhardy to spend $1000 on a powersaw and run questionable mix thru it ... Now depending where you reside the fuel is supposed to be regulated by the state or province but I’ll be a monkeys-Uncle if I’ve EVER seen em testing the neighborhood pumps ! I’ll stick with motomix as my first choice ; second choice 91 ethanol-free ... STAY AWAY from corn-gas !!!

 

[T.Roller]

Yes they do ... so after “testing” you determine your fuel is 14% ethanol instead of the 10% that it states on the pump ... now what ?

You don't buy from them anymore. Seems pretty simple. Thing is I buy non e fuel and test it everytime I fill my can to be sure it's e free

 

[TreeLife]

The Octane rating is simply the temp at which it takes to ignite fuel.

This is the only thing you said that is incorrect. Gasoline is largely made up of Heptane and Octane. The greater the octane rating of a fuel the greater its ability to resist detonation. Even a saw running 200+ psi is only making something like 8.5:1 compression ratio...which is mild. Rendering high octane fuels benefits unseen in our application. Adding oil reduces octane by (some say and it's mostly speculation, I haven't seen any data myself) by a couple points. So mid grade pump gas that's e free is more than fine.