Stihl 4-Mix oil ratio's?

[Chainmale]

Does anyone know if there's a reason I shouldn't run 32:1 in my Stihl 4-mix Combi's?

 

[hacskaroly]

Does anyone know if there's a reason I shouldn't run 32:1 in my Stihl 4-mix Combi's?

It will mean more oil....I run 40:1 in my FS-91 which is a 4-matic with no issues.

 

[Brad Button]

32:1 is way too rich. Over time you will get a lot of caron [unburnt] oil in the piston/cyl. You are much better off using what the manufacturer recommends. 40:1 is fine, I run both 40:1 and 50:1, and I use VP and Aspen fuels. In both my Stihl and Echo equipment.

 

[hacskaroly]

I use VP and Aspen fuels.

I use Harvest King...bottled by VP.

 

[DND 9000]

Use 50:1 like it is recommended by Stihl. Using more oil will carbon up the valves and valve seats. The HP Ultra oil was developed for these engines.

 

[Czed]

Does anyone know if there's a reason I shouldn't run 32:1 in my Stihl 4-mix Combi's?

They will indeed carbon up severely I've seen several that has
My nephew bought one over 12 year's ago runs 50/1 still running fine no issues.

 

[Chainmale]

Yea, was wondering about valves and seats. Also 4 stroke running a bit cooler.
Am trying not to use 2 different cans of mix, so might just stick to 40:1 for the saw's and Combi's iny work van, and 32:1 for my firewood saws.

 

[pro94lt]

it will run just fine @50:1

 

[Catbuster]

They will last longer at 50:1 with a synthetic oil. HP Ultra was designed specifically for that application. Too much oil will cause carbon buildup on valves and valve seats.

 

[pbillyi69]

i run 32:1 in my br600 the first time i ran it with that oil it have too high of octane fuel and didnt like it at all. but that gas is all gone and it runs fine i just had to adjust the carb.....so far no issues but i havent looked for any either. i have just made sure to keep the valves adjusted. it really didnt like 32:1 with the av gas at all but seems not to care about the extra oil so far