I have been too busy to change my oil (amsoil 5 30 hd) and was doing 7500mile intervals. now at 8000miles and ready to change it but have to order it. My father had a heart attack in spokane last night (1800 miles one way). If I went to cummins or a local truck stop, can I change to the cummins synthetic and then go back to amsoil at next service? I would rather drive than fly so I hav a vehicle when I arrive and don't have to worry about getting bumped from flights. you can post here - or e-mail me @ -- email address removed -- all lower case. Thankyou. Dennis
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