I asked a Stihl dealer/parts counter for a oil pump as mine is stingy on the oil. Parts Guy said the pump is not replaceable. Ebay shows them to be the same as the ms250 (Chinese stuff) I have replaced them in 025 and MS250saws. Parts guy looked it up while I was on the phone and verified it as a not replaceable part. I don't want to tear into it if it will be a futile effort. I will be going to the beg for manuals for more info but thought some experienced advice would be helpful. I know the saw is basically expendable but I like the light weight for where I am using it and it doesn't flare my carpal tunnel up which is a big plus.