Hi Kirk, I got to agree, with 172k miles, your going to start having other repairs than engine. If the price reflects that then no problem. A transmission alone is about $3k installed for a good one. I would strongly urge a DRW vehicle if you pull alot of miles as the added stability alone is worth the extra cost, about $125yr for fuel and tires, vs a SRW. Changing oil at 3k miles is a waste of money as most newer oils rated for diesel use, API- CI, can go beyond 5k usage without any problems. If you figure oil & filter change cost at 7.5k, your not loosing much vs with changing at 5k miles. Even at 10k changes the cost savings is not that much vs 5k. The bigest jump in cost is going from 3k to 5k. At 5k that's about 100hrs of road use and Chevron Delo oil has been tested (Chevron testing) to 400hrs with OEM filters without any problems. Most filters can not go that long. I get 250k miles plus out of my gassers so getting 500k miles from a 7.3 PSD wouldn't be hard as the engines turn 1/2 to 3/4 the rpm as a gasser does. Maintance on a diesel is cheap, fuel (15k miles or so) and air filters 25k or so. Diesel Fuel savings alone well off set any addtional costs if you pull by maximum torque rpm. You only need a kin pin to ball coversion plate to switch from a 5th to a GN provide you can lower the GN stem adjustment enough to level the trailer or can pull the GN trailer at a slightly high pin level. Some of the people pull GN stock trailers high so the urine drains from the trailer floor. T_Bone
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