Sam, I’m not going to try to give you advice. You obviously don't want it.
Jay, AKA "Creature Meadow" figures he's in $38/year for SUDT2 on a much larger machine. I know he uses his quite a lot.....
His tractor takes 10 gallons; yours about 6.
So his $38/year is about $23/year for yours (60%).
If 5 gallons of Coastal was $50 versus $104 for SUDT2, you'd save $15/year over 8 years, or $120 in 8 years.
Just for giggles - - I cut Jay's service time by 75% to 2 years. You'd save $60/year.....
$1.20 a week certainly makes it a worthwhile to gamble an $7,000 HST replacement in my book....I mean you only paid $30,000 or so for the tractor.
I have a good friend that never does preventive maintenance. It's too expensive....
He has a new TLB of a different color, and bitches at me for advice when it doesn't start or work for him in winter after sitting outside....
There's an old saying; "Penny-wise and Pound foolish...."
Maybe we should talk low-cost motor oils and filters....you could probably save at least $10/year there....
Geez.....I remember all those guys that come back to OTT after a couple years saying "my tractor won't move...."