Wow that's good to know thanks.....wonder how much of a difference the 4runner/FJ heads would make on our XR's supposedly it's around a 20 hp difference
I run amsoil severe gear 75w90......Chuck's corvette by ward usually has all amsoil products for our trucks including;
Amsoil EA034 Oil Filter
Amsoil 10w30 full synthetic signature series
Amsoil Severe Gear 75w90
Aloha