BBR conclusion was the stihl oil is the same as castorl stuff....look on back of your big brand oils and see who actually MAKES it.... I had bad run with the tt stuff..possibly double dosed the 261 and had to take it into shop to get sorted..the same fuel was simply drunk with out a burp by the 025 LOL. no flash harry filter in fuel system to get clogged up.saw would run but die as soon as tried to rev it.
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