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I made the recommendation for a thicker oil because you said that the gas engines have good compression but are losing bearing/lobes..... film thickness baby. You don't need the MPG improving 5w20 in those Ford modular motors.
Its also easier to stock one oil weight across the board for all vehicles. Any of the 5w40 or 15w40 synthetic HDEO's would work great in place of 5w20, 10w30, and 15w40 mineral oils. Since you're already using Chevron oils, try the 5w40 DELO-400 synthetic for ALL vehicles.
Hirev brought up the time interval. A synthetic should work better in that time frame(500hrs). This is why I'll recommend a synthetic. Mileage is meaningless. Install engine timers! Cost isn't an issue. Use the best oil.
I can barely read the pictures above. Feel free to separately post the oil analysis data in the UOA/VOA forums. You'll get a ton feedback there. The virgin(VOA), gas engine used oil analysis, and diesel UOA forums have gathered plenty of info in the past couple years. All that info is available(search for similar engines) and those forums have enough traffic, opinions, and comments to help draw conclusions without hiring consultants. Yep, oil analysis is a tracking device. This doesn't mean that every vehicle needs to be tracked. Similar drivetrains in the same enviroment should post similar numbers.
Silicon in an additive VOA could either be most likely anti-foam additives, or hopefully not 'dirt' from the manufacturer assembly line. I also don't see the need for 'oil additives' when using specific maintenance intervals and quality oils.
But, I'm a firm believer that diesel fuel needs an additive for cleaning and lubricity. And, now that gasoline is refined clean and some areas doped with alcohol(E10), a lubricity additive there might help also. There are plenty to choose from that can be added to the fuel supplys so that everyone refills with 'dosed' fuel.
Those air filters look like garbage. Simply change them more frequently if possible. Hire an air filter tech to make sure that every filter is changed weekly. Money isn't an issue. Buy more filters.
Another option is for your employer to contact an aftermarket air filter manufacturer and see if they can make a add-on disposable prefilter. AEM, Airraid, KN, AFE, Fram, Racor..... might be willing to create something if volume is there. Even a filter box using OEM sized panels or cones, but more or them, parallel or series, would help.
The same can be done with any of the other worn or broken parts. Contact aftermarket suppliers and see if they can make better replacement components. Better ujoints, better bearings, stronger leafsprings, larger diameter shocks, better brake pads,...... can be sourced.
Stress relieving of OEM replacements might make some last longer. Onsite cryogenics, meta-lax, parts refinishing,... prior to use are options to consider.
Sorry, nothing you do will make up for the driver. But speed limits, common sense, speed limiters, engine rpm limiters, are all options that can be considered. Since employee turnover is high, there is not much that can be done with the employees. Where does one apply for one of these jobs?
This company needs an onsite quick lube franchise to take the simple maintenance loads off the shop that should concentrate on the major repairs.
How are the transmissions holding up? And, any other components wearing out overly quickly?