Stihl chain oil and pre-mixed gas are pricy. Curious if a more generic chain oil would be satisfactory. And Husky pre-mixed fuel is significantly less expensive. Any problem with using that vs Stihl's on the MS 261 CM? Thanks for any thoughts. Oh, one more? Looking at a cordless air duster (my air compressor no longer builds pressure) to blow oil laden sawdust in cleaning the saw and clearing gas and oil caps areas prior to refilling. Any experience?