What are you guys running ?? I had Mobil 1
synthetic 15W-50 Racing Blend all last season in my 351W. For winter I dropped down to 10W-30 Mobil 1 mostly for start ups and short jaunts in cold temps. Now I cannot find the Mobil 1 Racing Blend anymore so I switched to Valvoline 20W-50
synthetic oil. Is anyone running a thinner viscosity
synthetic than 20W-50 in summer season ?