I take my 04 Cobra to Summit Point and VIR several times a year. During the summer months the engine temp is 105-118 deg C. Normal street operating temp is 88 deg C. Is there any benefit/disadvantage of running a heavier oil, i.e. 20W50 vs. 10W30? My thought was 20W is okay for summer start-ups and the heavier oil (50) would be better for the higher temps and higher engine loads.