Our winery has a BEI Grape Harvester and it has a Cumming Series B 3.9 L engine (around 10-12 quart sump). Anyone heard of any objections of using 0w-30 GC on a Cummins Turbo Diesel? When it's chilly out ( fall harvest) Felix has a bugger of a time getting it warmed up enough to start. Sometimes he comes in 2 hours early just to put heat lamps on the oil pan to warm the oil. (using straight 30W oil). I think since we only use this for fall harvest when the temps are fairly mild to chilly, we really don't need 30W oil. But, just wondereed about the GC Gold that I can get at the local AZ if that would work alright?