I love them. Have had two 075's and a 075AV. Now have a 076AV. Before the lightweight saws came along the 075 and 076 saws ruled the big timber area where I live (Up on the Olympic Peninsula of Washington).
I gave the 075 and 075AV saws to the son in law, he logs big timber in the Oregon Coast Range. He has lighter saws but when he is in the big timber the 075's go to work.
Looks like the oil adjust lever is set to low, but turn it up to high (towards the plus sign). Thin your chain oil in the winter, I thin with 25 percent kerosene. Pump the hand oiler a lot!!! Long bars and chains need a lot of oil. I use "house blend" oil from the Stihl Shop, $11 a gallon.
If you mill with the Alaskan Mill, buy and use the auxiliary oil tank.
From the pros at the Stihl Shop here in Port Angeles: Run the fuel at 25 or 32 to one. Do not run at 40 or 50 to one, especially when milling with long bars. Good oil is cheap. Never use automotive oil or marine 2 cycle oil.
I have hundreds of hours with these saws and use good two cycle oil like Stihl and never have had a problem at the above ratios.
Chains: After I sharpen, I clean the chains with gasoline, dry, and lay out on a drip pan. Then squirt chain oil on the chains and let soak overnight before I put them back on a saw.
Cleaning a chain (for 6 feet of bar!) with brake cleaner prior to sharpening. Drip pans are handy.
I bought the Super Jolley (have not used it yet, the wheel is not mounted) for those long milling chains.
Oldies. The 076AV is low hours and the 090AV in the background hardly has 10 hours on it, it is darn near mint!