Can anyone tell me whether Mobile's diesel synthetic oil is available anywhere in the Washington, DC area? Or, even if it is purchased over the internet or at a CAT dealer, how much gallon jugs cost? I have located a shop that sells Amsoil diesel oil by the quart, but at $9 each I'm wondering if Delvac is cheaper.

Thanks,

GregS
'84 300D, 173k
'90 300CE, 162k