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Read articles →An owner-operator walking through the full 300-hour service on an RK25, covering coolant flush (including a real-time drain-port clog he works through), dual oil drain plugs, oil filter swap using Shell Rotella 5W40 synthetic diesel, air filter replacement, dust port cleaning, and radiator screen blowout. It's practical and unscripted, with honest observations about fluid condition. Best for RK25 owners approaching a major service interval who want a realistic step-by-step reference.
An owner-operator sharing hands-on maintenance from their own property, with no apparent commercial or dealership affiliation.
Air filter, oil, oil filter, and coolant are the main items for the 300-hour service, plus general checks like making sure bolts stay tight.
The pan has two different reservoirs in the same pan, so you remove both plugs to make sure you get all the old oil out.
He uses Shell Rotella 5W40 synthetic extreme diesel oil for the 300-hour oil change.
The drain port was clogged at first, so fluid just ran down instead of draining; after running the engine again it worked and drained about a gallon.
