New stihl FS56 trimmer spitting out oil

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volk06

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I bought a stihl FS56 about a month ago and today was my 5 fill of gas on the trimmer. I bought the 6 pack of stihl ultra HP oil to get an extra 2 years on the warranty.

Today when I was trimming I noticed the exhaust started to get oil specs on it and on the plastic cover. I cleaned up it but I took a few pics after cleaning it up, you can still see a small amount of the oil on it. Is it normal for a trimmer to spit out oil at a 50:1 ratio? I never noticed the muffler turning blue until after today. I was cutting thick grass but I wasnt at WOT very much at all since it is still newish.

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They all do that???

Every weedwacker Ive used, going back to models from the mid-80s have had some oil in the exhaust area after use, even when the ratios are perfect.

If yours is used like mine, it isnt always WOT, unlike, say, a leaf blower. I think that may have something to do with it too...
 
This is the first 2 stroke engine I've owned in a very long time so I'm unfamiliar with the characteristics of a 2 stroke.
 
It's perfectly normal. That 2.6 ounces of oil has to go somewhere when it passes through the engine. Some of it goes up in smoke, some of it will agglomerate and wind up on the exhaust system/cover and some of it will be converted to heat energy.

Stihl sells three different 2-cycle oils but their partial synthetic is the only one that actually carries the ISO-L-EGD and JASO FD ratings. I would personally use the HP Super (partial synthetic) over the unrated full synthetic HP Ultra. I think Stihl makes enough from the profit of selling the higher priced synthetic oil to offset the cost of one additional year of warranty. This is why the warranty extension is offered. The 'fully synthetic' moniker goes a long way to padding the bottom line.

Full synthetic HP Ultra = no ratings
Partial synthetic HP Super = ISO-L-EGD and JASO FD rated
mineral High Performance = no ratings
 
It doesn't really look like oil to me. More like heat discoloration. Do your FS56's in the US have built in catalytic converters in the mufflers? If so, the mufflers get hot.
 
Nothing wrong with it IMHO, it just means that the oil in the premix is good at withstanding the temperatures in the combustion chamber and some of it exits via the exhaust port. I'll take that any day over an oil that gums up on parts or turns into deposits into the combustion chamber.

P.S.- If you think that's bad you obviously never run a nitro engine with 20% castor oil in it
laugh.gif
 
Originally Posted By: mechjames
It doesn't really look like oil to me. More like heat discoloration. Do your FS56's in the US have built in catalytic converters in the mufflers? If so, the mufflers get hot.


the pics are after i wiped the oil off
 
My stihl trimmer does that every time I trim and I have exclusively ran stihl Moto-mix since new. it's normal. I always attributed it to the quality of the oil. If you have ever used cheap Conventional oil, you would have black hard carbon building up on your screen instead of just oil. I doubt you or I will ever have to clean our screens using primo stihl oil.
 
I bought the same exact trimmer last week. I'm only 2 tankfulls in now but thank you for posting this thread as mine is doing the same thing...lol
 
New mufflers are EPA madated to include a catalytic membrane. they run hot enough to turn the muffler blue.
As soon as it is out of warranty, mod the muffler and cut screwdriver slots in the adjustment needles for cooler running (and more power).
 
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