I saw this stuff at lowes today that is called pro mix. Supposedly you can dump one container into a gallon of gas and it works for all ratios. Ive been using it for awile on my blower and edger and they run great. however, i just bought a new stihl weedeater and have been having problems with it. is this stuff ok to use or should i use the stihl oil? could this stuff being causing the problems on my new weedeater?