Can I run 40 to 1 in my new stihl ms 180. It's What I have mixed up allready but don't want to hurt the little guy. I grab the saw from my dealer on the way up north but grabbed my wrong gas can. It's mixed 40 to 1 with vp oil. But I don't think the ms180 carb is adjustable
40:1 in my new saw
- Thread starter Welderman85
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I use 40:1 in everything.
I run 40:1 in my 180s and just about any other saw I own.
Congrats on your new saw 
you’ll be fine. If you want the most life from it, consider buying a walbro WT215 and doing the simple mod to it to have it work in your saw and you’ll then have high and low adjustability!
you’ll be fine. If you want the most life from it, consider buying a walbro WT215 and doing the simple mod to it to have it work in your saw and you’ll then have high and low adjustability!
I run 40to1 in everything as well. No issues, do the upgrade carb like Tom says and tune the saw for the mix.
Ditto on the 40:1. That's what I run in my saws. You don't have to worry about wearing them out, that's for sure...
Mike Ray
ArboristSite Operative
me too on the 40/1 ,oil is cheap cylinders and pistons not so much.
KostasVolos
ArboristSite Operative
Personally I use 40:1 ratio with low
viscosity oils ( "thin" 2T oils like Castrol Power 1 Racing ) ,while a 50:1 ratio is used with "thick" ones ,like Amsoil Saber .
I prefer JASO FD full synthetic oils and avoid using any dino/mineral ones.
The MS180 with stock carb doesn't get along that good with thick oils at 40:1 .
viscosity oils ( "thin" 2T oils like Castrol Power 1 Racing ) ,while a 50:1 ratio is used with "thick" ones ,like Amsoil Saber .
I prefer JASO FD full synthetic oils and avoid using any dino/mineral ones.
The MS180 with stock carb doesn't get along that good with thick oils at 40:1 .
I was running Saber at 40:1 in everything with good results.
I also use 40 to 1 Amsoil Saber in all my saws, trimmers, blowers etc. never had an oil related failure
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40:1 Castrol and non-eth 91/92 octane is a good option. Got several older saws that say 40:1 a couple say 32:1 most are 50:1 so it's a universal premix in one gas can. If it's a true vintage/antique saw from before the 70's just add a little more to a almost full fuel tank. If your killing all the mosquitos cuz it's smoking alot I don't think anyone will complain. That Stihl "high performance" oil is made by Castrol. (orange bottle). Don't use the other "ultra" Cod, lizard and used cooking oil blend
I bought Saber and dominator. I ran a quart of saber at 40:1 then opened the dominator. I ran most of it at 40:1, I just mixed some at 36:1 for curiosity. I haven't run any yet.
More carbon, sooner.
Not with good oil.
Couldn't the same argument be applies to not needing a mixture as rich as 40:1?
Modern oils provide adequate protection st leaner ratios.
Personally I just put 4.8gal instead ot 5.
I wasn’t making any comments towards that. Just saying that using more oil doesn’t necessarily mean that you’re going to get carbon buildup
Gotcha.
From the oil tests I have seen, the less oil, the more carbon. You should see what a mess 300:1 makes.
Natty Bumppo
ArboristSite Operative
The carb replacement might be a great idea. But if it were my new saw, I wouldn't do it while the saw's still under warranty.Congrats on your new saw
