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It might be that, but I haven't really noticed a drop in fluid level. I will be back at the shop on Monday. I will absolutely check it. I have also heard of the injection pump leaking. Could it be that also?

I did. I used my engine serial number on parts.cummins.com and got the part number. Just like Wes said, I ordered it online. It was cheap. Shipping was $3.00 more than the part..... I also noticed my water pump was leaking. I ordered one of those as well. I have an oil leak on the...

I got the high dollar fleet anti-freeze from my fuel supplier so it really wasn't that expensive. It is specifically for HD diesels.

Does anyone know the part number for the thermostat housing gasket? I have a small but steady leak at the housing. I have included photos. Hard to tell what it is but the photos are directly behind the alternator mount. I have a heavy amount of rust in the system so I will be doing a flush...