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Read articles →This is a hands-on, step-by-step oil change walkthrough on a John Deere 4066R, not a dealer overview. It covers removing both side engine panels, draining the oil, swapping the horizontal filter, locating the hard-to-find fill cap, and refilling with John Deere Plus-50 15W40. Real numbers included: 1.2 gallons capacity, filter part number, and a rough total cost around fifty dollars. Best for owners doing their own maintenance.
Posted by the Tom Armstrongs Way channel, an owner sharing a practical, first-person DIY maintenance walkthrough on their own machine.
Raise the hood, remove both side engine panels with a 10mm socket, drain the oil with a 17mm socket, swap the horizontal filter, then refill through the hidden fill cap with Plus-50 15W40.
It is a hard to find double 07 oil fill cap located behind the right side engine compartment cover, which must be removed to access it.
It holds 1.2 gallons, so you need to buy two gallons since the oil is not sold in smaller increments.
About fifty dollars total, with the oil filter costing $9.28 and two gallons of Plus-50 15W40 oil at $20 per gallon.
