Is located in the Roanoke Valley which is in the southwestern region of the Shenandoah Valley of Virginia. Also, many boats, in particular modest cruising sailboats, operate their engines infrequently and for quick periods of time, when pulling into or out of their slip. Contact us right now to come across out why our remanufactured diesel engines are superior to the rest. The diesel engine oil is primarily based on C opening, the back of the letter is also the same with the greater. If you’ve just bought a utilized boat, get a quick diagnostic of the engine and all its systems.