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Fleetgard MicroGlass LF3552 is good ($6-$8). AutoZone carries Deutch/STP filters ($4-$6) which are good, though I wouldn't use them with synthetic oils. As other posts advise, stay away from Fram for the time being... . Review the recent TDR article on filter composition for more info.

I've not had the leaks (fortunately), but I did replace the stock plug with Geno's EZ Change Plug and Draintube (part #s 0428 and 0601). The EX plug does not negligably reduce ground clearance, and the setup makes for real easy oil changes. I recommend it.

Look at the following link for more info on oil categories (the "S" for gasoline, "C" for diesel). http://www.api.org/programs_services/quality/oilchart.htm In general, CH designation meets/supercedes any prior CF specification.

Thanks for the replies and useful info... I was in/under the truck again today and still cannot find any evidence of leak, nor can I detect cracking fuel lines/hoses. I guess I'll give our Cummins South service center a call...

Thanks for the input. I now know where to begin looking. Haven't had the opportunity today to begin probing again. I'm curious: what's the going rate (parts + labor) for (a) lift pump, and (b) fuel line replacement? Sounds like both are potential problem areas, so if I'm correcting one I might...

Have an intermittent starting problem: when truck has been parked with nose on uphill angle (slight) experience "loss of prime" - have to manually prime to start. No loss of power when running. No visible fuel leaks, and no loose connections that I can find. No similar problem when truck has...