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Read articles →An owner doing his second oil change on his own Workmaster 75 at 543 hours, sharing specific hard-won tips: the awkward filter location requiring sensor and fitting removal, the 12mm drain plug with washer, the NAPA filter number, and a caution about overfilling (he targets 2 gallons of Shell Rotella, not the full 2.3). A short, practical walkthrough most useful to Workmaster 75 owners tackling this job themselves.
An owner-operator named Brad sharing hands-on maintenance experience from his own farm, with no apparent commercial affiliation.
The drain plug is a 12 mm plug, and it has a washer that stays on well during removal.
You have to remove a small sensor and a fitting first, since the filter sits in an awkward spot on the left side of the tractor.
The spec is 2.3 gallons, but the owner fills to about 2 gallons of Shell Rotella since a full 2.3 made it too full last time.
He references a NAPA filter number that is the same filter as the Wicks brand, just with the five removed from the number.
