Is 91 fuel suitable for Stihl chainsaw ? Reading conflicting info.
desmodave,
Oct 18, 7:54am
Reading where ? chainsaw forums ? . Stihl nz site only mentions oil to fuel ratios . Stihl usa says a minimum 89 octane . Have you just bought a domestic 180 , or a pro saw . 9 times out of 10 i run 95 on big saws doing hard work . For short cuts around the home i doubt it would make bugger all difference . What does your manual state .
blogzy,
Oct 18, 8:00am
Recently purchased used ms280. 55cc. No manual.
pettal,
Oct 18, 8:03am
type of oil and ratio would be more important .
lythande1,
Oct 18, 8:04am
Yes 91 is what you use, we have one and a manual. BTW you can download a manual.
skull,
Oct 18, 8:05am
I've always used 95 for my 2 strokes, I don't use 91 in anything at all. The price difference is negligible for the quantity of fuel you are going to be using.
blogzy,
Oct 18, 8:29am
Agreed, I'm using Stihl 50/1
intrade,
Oct 18, 8:33am
basic rule of thumb is to if possible not to use 91 ron more important on a 2 stroke is however the good 2 stroke oil. 2 stokers wear out fast and wear out anyhow as all that lubricates it is the 2 stroke oil in fuel. first world countrys all do not sell 91 Ron they sell 95 minimum as lowest grade.
blogzy,
Oct 18, 8:37am
Just checked the manual. 😊. minimum octane rating of 89 (R+M/2) What are they referring to re r+m/2 ?
blogzy,
Oct 18, 8:59am
What are they referring to re r+m/2 ?
To answer my own question I believe thats mon. (us) Is that equivalent to Ron 93 ?
desmodave,
Oct 18, 9:07am
If you just google that you can learn all about the Anti-knock index and Ron and Mon . As my Nana told me when i was a kid , it's better to have to much than not enough .
martin11,
Oct 18, 9:23am
91 is the biggest seller in Australia and the USA has 87 available as the minimum .
Also keep the ethanol containing petrol away from the equipment that does not like it.
electromic,
Oct 18, 1:11pm
I run 98 and 50:1 with Stihl 2 stroke oil in all my 2 strokes. That was the recommendation from the service manager at my local Stihl shop. Before 98, I just ran the highest octane available. My 021 is from the mid-1990's runs as good as new. My 2 stroke victa did 20 lawns a week for 10 years and still starts on the first pull and runs as new. It has been my home mower for the last 6 years. It has over 10 000 hours on it. No ethanol at all, ever.
blogzy,
Oct 18, 1:56pm
not much you guys don't know, thanks 😊
mrcat1,
Oct 18, 4:21pm
You've got it right, Husky came out a few years ago and said to only use 95 in their equipment, and anything over 65cc needs to be run at 33:1 on Husky oil.
nice_lady,
Oct 18, 4:27pm
Hmmm. hubby has a stihl weed eater. Should this also be run on 95 or up (2 stroke mix of course)? . He can get avgas lol but that's leaded and might burn it out?
He currently uses 91
kingfisher21,
Oct 18, 6:57pm
91 is weasel piss, I wouldn't use it in anything.
paul861,
Oct 19, 6:56am
21 year old 044 ,its run on 91 its whole life. goes like a new one. i use stihl oil.
MBIE test petrol quality regularly in NZ. Who knows if US recommendations are just to cover variable quality?
mrcat1,
Oct 19, 5:52pm
Avgas will be fine, it only becomes a problem if it has a catalytic converter.
intrade,
Oct 19, 7:05pm
i think the good oil raises the octane possibly as higher octane is less igniteable. its quite confusing but engines dont run on explotions and the petrol engine just slapps the piston as where Diesel pumps it . We have had a lot of threads about it its qute confusing if you dont know and undertsnd all facts. When richard mc custian said the petrol engine only slapps the piston my penny dropped back then-
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