Best Engine Oil for Big Rig Over-the-Road Diesel Semi Trucks

Best Engine Oil for Big Rig Over-the-Road Diesel Semi Trucks

So, what’s the best engine oil for a big rig OTR (Over The Road) diesel semi truck? These trucks are serious business running around 15 gallons of oil, depending on the engine.  Serious business, they’re keeping the economy going.  Serious business such as these trucks need the best diesel engine oil, the very best 100%…