I am impressed with the specs on there oil products. so I bought a few cases of 15/40. The oil is good for extened drain levels , but what about the stock fleetguard filter. How many miles between filter changes. My 12 valve is turned up to 400 horse power, and my third gen cummins is expecting twins. ps thanks Vetteman & Mark http://specializedlubricants.net/ At 8000 miles I feel the oil cost effective.
Corrected link.
[ September 18, 2004, 03:39 PM: Message edited by: 59 Vetteman ]
Corrected link.
[ September 18, 2004, 03:39 PM: Message edited by: 59 Vetteman ]