Is there a big diffrence between the brands of bar and chain oil (Stihl, Husquvarna, or the store brands, TSC....) I have always used Stihl oil but the closest dealer is now farther away from where I live and I have been buying more stuff at Tractor Supply. I still use Stihl or Husq. 2 stroke oil. I now have a bigger saw and noticed that a bigger saw means more oil so I am also trying to be cheap when it comes to Bar and Chain oil.