You didn't burst anything but your lack of knowledge mostly. C is a factory accessory on a Stihl chainsaw. Is my 018C mtronic?... no. It does have a tooless side adjust for the bar and chain just like others.I hate to burst your bubble, but by looking at the pictures, I can see that it has carb adj. screws and therefore it is not a “C”. Also, it is an older saw based on the top cover that accommodates the old style air filter and that the tank housing is discolored. The old saying, a picture is worth a thousand words is very true.
So the tank housing is discolored. I didn't bleach it like many do. It does have the double style 311 type filter that I prefer over the leaky HD model on my other 362.
The old saying the uneducated tend to stick their foot in their mouth when they open it seems to apply here you think?
Any more questions, boss?