Looking to change to Amsoil syns with extended changes. Both my vehicles get regular useage, the wife's Explorer logs about 25-28K per year. The extended changes with their regular syn oil (1 year/25K) would be an ideal match but there is no way I will make the mileage with my F150, only 10-12K per year. Question?? there is also a time limit of 1 year for the oil, What is the time limit for? Isn't the oil stable enough to last the mileage limit on my truck? Thanks.
WDP
WDP