I run
synthetic 15-50
oil. Engine is a 351W with approximately 450 FWHP. Pump is a high Volume Melling; Canton road race pan with trap doors. Motor is about 7 years old with 5-6 track weekends per year on it and seems to be holding up OK. I will look into the pump and bigger coolers. I thought 260 was fine and that a good
synthetic could go all the way to 300.