I have mowed our steep (1.5 acre steeper than 45* is part of it) hills for 55 years and our Kohlers have never had a lubrication issue. Kohler must have done something right, I got over 30 years from one K321 mowing our hill and that includes my teenage years. Anything that survived my teenage years is bullet proof. Our 147 is very stable on steep hills, that is why I won't replace it. When it was new I took it to the steepest part of our hill and pushed on the uphill rear tire to see if I could get it to raise up. It was solid with no interest in rolling over. I have added fluid and wheel weights and they help keep the uphill tire from spinning on the steep parts.
The only time we had a rollover was when my sister was on an original and got stuck going up a hill right at the top. She was stuck so she pushed the clutch in. She rolled backwards down the hill and near the bottom she turned the wheel and it rolled over. She was pinned under it with the blades still on and a kind truck driver stopped and helped get it off of her. She wasn't hurt but Dad never let her mow again.
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