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Fuel cools , oil lubes -gasoline will produce more power per ounce than oil and cools the top of the piston . The service manual recommends 50:1 on my STIHLS and Husqvarnas. These are modern hi-performance chainsaws , not Pullins from 1970s era. Too much oil will bite you in the ass down the...

Big difference between chainsaw milling (running the piss outta the saw - full throttle long extended cut time) and limbing and bucking where you are making cuts intermittently and not on the throttle continuously

Milling is a different ball of wax ... IF you are running the snot out of the saw a “torque port” and 40:1 ain’t gonna hurt the saw ... Remember you are taking looooong extended full throttle cuts when milling - much moreso than a 10-20 sec cut when bucking or limbing with a rest in between ...

50:1 is what is recommended in the manual that comes with STIHL and Husqvarna Saws I own. The advances in oil tech have come a loooong way and 50:1 synthetic oil with a spot on tune will provide the end user with 1000-2000hrs of use providing a sharp chain is used and recommended maintenance...

A gallon is 128 Oz .... at 50:1 the amount of oil used is 2.56oz per gal - at 40:1 the amount of oil used is 3.2oz per gal or approximately .64oz of oil per gal more at 40:1 than 50:1 ... If you are running an mtronic or autotune stay with 50:1 despite what nutball insists, there are reasons...

Haha ... complete rubbish ! ALL manufacturers recommend 50:1 using THEIR mix oils ... EVERY ... SINGLE ... ONE ! I’ve put hundreds of hours on saws and torn them apart and everything was well lubed and clean with exception of some carbon buildup on piston. The high compression 2-stroke ...

Can be repaired