Biodiesel That Pan will ONLY slow down the operating Temp Time ( Because of more fluid) Thats It..... Now to the 452K VM3.0 There Are NO VM3.0s that have made that mileage that are COC, only a few Illegally operated Eco 3.0VM made that Mark. The rest have had early retirement or $1000s in repair.
1/2 Ton DSL's are on their way out, The Additional cost of INSURANCE, Fuel, Maintenance, Repairs, and the upfront cost of the 1/2 ton DSL engine negate any advantage over gas. Ford and GM have already Drop the 1/2 Ton DSL, Stellantis will be joining the out of Production soon, I'm surprised its even in production at current. So save up that $$$ and you will see when you buy that 5.7L Limited you wish you would have done it sooner.
The only way the 1/2 ton Ram Ton DSL will survive is new power plant....and Yes FPT has one.