I have a stihl 028.. i am wanting the best chain /bar for this saw, I cut mostly red oak,black oak,ash,gum.. The standard chain will not stay sharp very long at all.. Local stihl store was no help, Hardware store wasn't either...They didn't want to sell anything without that saftey chain. I want something that doesn't dull so easy and cuts good. I don't cut in dirt,chain is oiling great. currently uses the oregon L74 chain , Any help would be apreciated. thanks.