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Message: [QUOTE="CATDiezel, post: 1405960, member: 4387"] Economics. However. I've seen my far and far share of Cat mining dozers and loaders work extreme and long times before a certified rebuild on the original engine with 75k hours on it. No big deal. Have seen the same slap worn out F350 trucks in the field pushed WELL past 300+ thousand miles and never seen a pressure washer a day in there life. Bulk oil from a 55 gallon drum. I agree with you Jim. Truly do. But economics comes to play in the equation. I personally tore down my dad's 5ek38051 serial numbered engine out of a farm truck Pete that regularly pulled over 100,000 lbs near 1 million miles. All he did was change the oil and filter every 12,000 miles. Dump and go. Lots of off road and abuse and solid idling. I can hardly recall the truck shutting off as I was a young man growing up. Same exact truck. Million miles later.... no wear. Liners perfect. Main bearings laughingly perfect. This is just ONE personal example of watching a truck from birth to 1 million miles. Being the truck is still in the farm fleet it now has 1.5 mill on it and has yet to see so much as nothing more than simple Rotella bulk drum oil changes. Now for the level you personally are helping people.... that takes extreme dedication from a TRUE fleet maintenence manager to comply with strict orders on service and consistency of records.... and they are out there. My main point was the length of time an average guy keeps a truck. The failures that wipe out the engine are NOT oil related for the large majority. If an engine is starting to self destruct, filtration is not going to stop it from happening. I do want to reiterate that I respect your love for oil and passion for helping fleets extend the life of an engine or drive train components. As do I, just not to the same level anymore! To many regulations to give a crap!! Haha [/QUOTE]