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View Full Version : What kind of gas for should i run for a Fs-110x 4 mix


DRBLawnBuster
06-18-2009, 10:51 AM
i just bought a stihl fs-110x and its the new 4 mix what kind of gas should i run, like 50:1 like my stihl blower. Or can someone tell me the best to run in it

kaferhaus
06-18-2009, 10:54 AM
They didn't give you a owners manual??????

89 octane in all Stihl equipment.

Read the manual, if you forgot to get one, go download it

DRBLawnBuster
06-18-2009, 11:11 AM
i bought it used through my dealer they were selling it for some one it only had like 2 hours of use and was 100 dollars cheaper.

mhussey
06-18-2009, 12:27 PM
I have been using the Sthil synthethic oil in my FS90. Seems to be working fine. I use 93 octane though @ 50:1.

cgaengineer
06-18-2009, 01:31 PM
I use 87 in mine and the white bottle oil and I have no problems.

WH401
06-18-2009, 01:32 PM
I use Amsoil Saber at 80:1 w/ 89 gas. Don't run anything less than 89 and you'll be fine.

Richard Martin
06-18-2009, 05:04 PM
I use the same thing in my BR600 as WH401 uses. Shell 89 with Amsoil 80:1. One fuel, one oil and one ratio for everything. No mistakes that way.

DRBLawnBuster
06-18-2009, 05:35 PM
so the 80:1 has more oil then the 50:1 or is it the opposite

WH401
06-18-2009, 06:32 PM
so the 80:1 has more oil then the 50:1 or is it the opposite

When you run 80:1 you have less oil mixed in. The Stihl oil is good, but the Amsoil Saber is even better. You'll get better protection from the Amsoil Saber at 80:1 than you will from Stihl, or most any other comparable oil, at 50:1. The main reason I run it is the same reason Richard Martin does, you only have one ratio to deal with. That and the performance benefit is a big plus as well.

cgaengineer
06-18-2009, 06:48 PM
All my equipment is 50:1...80:1 is to lean for me...synthetic oil is still derived from dino oil...why take any chances. I have a friend on the forum that was using 80:1 Amsoil and he lunched the main bearind and scored the cylinder. I'll stick with Stihl oil in Stihl equip for no other reason then a warranty claim.
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STIHL GUY
06-18-2009, 08:34 PM
i just bought a BR600 and my dealer told me to run 93 octane with Stihl synthetic oil (white bottles)

HenryB
06-18-2009, 08:40 PM
87 and Walmart oil at 50:1 3years many hours. No problems or failures at all.

Duffster
06-18-2009, 08:44 PM
so the 80:1 has more oil then the 50:1 or is it the opposite

:hammerhead::hammerhead::hammerhead:

cgaengineer
06-18-2009, 09:00 PM
Think about it like this...if it was 1:1 ratio would you have more oil per gallon?
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Mahoney3223
06-18-2009, 11:37 PM
50:1 and 87gas is fine...give me a break 89, 93 doesn't make a damn bit of difference, i've been doing thing 8 seasons and never had a problem

topsites
06-18-2009, 11:46 PM
I don't play around either, 93 octane premium and Stihl oil, all my handhelds are 3-8 years old.
Although I will be switching to Opti-2 one day, but still 93 octane, always.

just4funthen
06-18-2009, 11:54 PM
I have the same trimmer you do, got it 2 years and I use stihl 50:1 full synthetic. Sometime echo's power mix 50:1 but I love the stihl's synthetic oil, when the FS110 burns it, the exhaust smells like Kettle popcorn you get at the fair! With the FS110 and the full syn oil mix you will have faster acceleration, and better performance. Also everyone says use 89/93 octane. They are right but I use 87. Never had a issue. I use the less octane since its a dollar a gallon cheaper and I use at least 3 gal of oil/mix a day!

lawnboy dan
06-20-2009, 09:25 AM
stihl ultra only

Duffster
06-20-2009, 09:35 AM
E10...............

blake101
06-20-2009, 09:44 AM
I have been using the Sthil synthethic oil in my FS90. Seems to be working fine. I use 93 octane though @ 50:1.

Just bought a new one yesterday. I am going to use Sthil synthethic oil and 93 octane also 50:1. It can't hurt to be on safe side.

dishboy
06-20-2009, 03:46 PM
All my equipment is 50:1...80:1 is to lean for me...synthetic oil is still derived from dino oil...why take any chances. I have a friend on the forum that was using 80:1 Amsoil and he lunched the main bearind and scored the cylinder. I'll stick with Stihl oil in Stihl equip for no other reason then a warranty claim.
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I 'll bet he had another issue than the oil. Running less oil fattens up the a/f ratio , fuel burns cooler than oil. I have a shindiawa T270 that is ten years old, in fact I just wore the clutch drum completly through, but my cylinder /piston looks wonderful. Problem is operators are not smart enough to stop and figure what is wrong when something changes , but keep running the machine until it's to late.

bighaydenslawn
06-20-2009, 03:50 PM
I have an FS-90R and I tun 89 Octane with the Stihl 50:1 Synthetic (White bottle).

mictrik
07-17-2009, 01:25 AM
I bought a Stihl FS90R that was used for 1 season by a landscaper. The machine started and ran well when i bought it but did exhibit some rough idling. I noticed the exhaust port had a good amount of carbon build up and that there was carbon on the exhaust valve stem. I cleaned out the carbon from the valves, exhaust port, muffler/screen, and the cylinder. I used Stihls "decarbonizer" (EDTA) letting it sit overnight and then ran Shell 93 with Motul 800 2t at 50:1 and a tad of techron concentrate through it. Everything looked very clean and the trimmer starts, runs and idles flawlessly, idling issues were gone. I have since continued with the Shell 93 and Motul 800 and have yet to experience any change it the way the unit runs. I have never had to de-carbon any 2 cycle motor when using the Motul 800 2t so i stick with it. This oil costs between 12 and 16.00 per liter (33.8oz). 1 Liter will mix 12 gallons of gasoline at 50:1. IMO this oil is superior to most all synthetic 2 cycle oils sold and it costs less than Stihl, Echo or Redmax synthetic blend oils. With regard to the use of Techron all i can say is that the product really works as i could see the improvement looking at the exhaust valve before and after using it. Chevron does not officially recommend the use of Techron in gas/oil mix engines because they would have to test it with every brand and type of oil. I have used it successfully a few times with Motul and have not experienced detrimental effects.

South Florida Lawns
07-17-2009, 01:29 AM
110 and no oil

cgaengineer
07-17-2009, 07:42 AM
110 and no oil

They run really fast like that...more power...for a few minutes anyway.:laugh:

cgaengineer
07-17-2009, 07:44 AM
I 'll bet he had another issue than the oil. Running less oil fattens up the a/f ratio , fuel burns cooler than oil. I have a shindiawa T270 that is ten years old, in fact I just wore the clutch drum completly through, but my cylinder /piston looks wonderful. Problem is operators are not smart enough to stop and figure what is wrong when something changes , but keep running the machine until it's to late.

Its possible, but why run less then the manufacturer calls for...why take the chances?

Wizz
07-17-2009, 03:03 PM
All my equipment is 50:1...80:1 is to lean for me...synthetic oil is still derived from dino oil...why take any chances. I have a friend on the forum that was using 80:1 Amsoil and he lunched the main bearind and scored the cylinder. I'll stick with Stihl oil in Stihl equip for no other reason then a warranty claim.
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+1. Look at 2 stroke race motors (shifter karts or dirt bikes), you will never find someone using some 'special' oil that advertises using less oil in the mix. Shifter Karts actually run a ~20:1 mix and nowhere in the pits will you see anyone using Amsoil. The Stihl synthetic is every bit as good as any other synthetic, Motul products are top notch and used in many race apps. .02