I really want to run Amsoil to increase my orders with other maintenance...but if next time I still do not get the life out of it I will stick with Delvac (Wally World most times $10/gal)
As for the additives I have run:
1. Howes - yuck
2. MMO - carry over from farm days, thought my truck liked it.
3. PS - never an issue and readily available - thought my truck liked it.
4. Amsoil - tried two types and can't say either way if I saw anything different vs PS/MMO
5. Super Tech - used the 1 oz / gallon ratio and my truck did not like it..poor mileage (may re-visit in lower levels to see if there is a sweet spot).
6. Used motor oil - What a "F-in" mess, couldn't pay me to deal with that again.
7. Lucas - No real opinion, never noticed anything different vs PS / MMO.
8. Soya oil - NOw I can say that a 1 gallon add to a tank full of #2 diesel ran the most smooth and got the almost best mileage..but found out sinceitwasindustrial grade (for ink) the ph was too high and may cause issues).
9. Opti Lube - broke down and ordered it, have to say it stinks but so far in three tanks I have been getting 21+ on over head with 25.6 today on empty truck at 70 mph back from hunting camp (262 miles on 1st quarter tank)
As for the postassium...dunnoi it just disappeared! I want to re-check with this oil change and see if it is still down