I’m looking at buying a 2000 379 with 6NZ01023 under the hood. Can anybody with access lookup the info on this engine for me. The seller has paperwork for a platinum over haul on it with 3 year warranty that went into effect May 7th. Says there’s an optional 4th year for like 2500 bucks. But the engine has no serial number data plate on it. I do know it’s not the original engine in the truck. I called Peterbilt and what they have on file is a 6NZ05 something.