Read again. Amsoil says 25k miles or one year.
On a side note, I change my F150 oil and filter every 2 or 3 years on SuperTech Synthetic.
I agree, I don’t consider time a factor in my maintenance, I don’t want to waste resources, I’m doing 10K OCI on 2GR-FE which is what the manufacturer spec’d with 2-3 oil changes on the same fram ultra, I’m using extended performance oils that are now up to 20,000 miles but I will only extend my OCI when I get around to doing UOA
I’m currently living in a small college town so everything is 1-5 miles away with only 30 mph speeds and extreme cold start up, even in the summer it’s 30-35F in the mornings
Or because nothing is close by, if we need anything else, I’m driving 75-150 miles minimum one way at 82-85 mph
super short trips or super long trips on the highway.
I’m basing this on UOAs on the 2GR-FEs I have seen here with some even more severe duty doing 10K OCI on SuperTech Full Synthetic.
it all depends on the engine, is your engine a problematic engine? have you seen any UOA on that engine and how is the maintenance history? If everything is kept up to date, then get an oil extractor and do UOA until you can get a fair understanding on how the oil is performing on your engine with your driving habits and you will know how long you can maybe run the oil.
skip the Amsoil, cost doesn’t make sense to me, there are many capable 20,000 mile oils that can be had on sale for very cheap, even the Advanced SuperTech now is rated at 20,000 miles ($16.xx) just do a UOA and see how everything is to know if you could go multiple years on the oil of your choice