I got a credible explanation for the milage and have no maintance history. It was supposed to have some but the main reason I bought it was cause it was a 5 speed. I use Penzoil Long Life (their diesel oil) 30 weight (I dare anybody with lots of time to ask me why) and I might use the 40 weight come summer to reduce the usage. The plugs look un-fouled but I guess I should keep an eye on them.