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Read articles →This isn't a general review but a narrow deep-dive on cross-referencing oil filters for the Bad Boy 4035H, from an owner with about 350 hours on the machine. It covers the OEM Kuok J part number, Napa Gold and Wix equivalents, bypass PSI differences (Baldwin's 20 PSI vs the stock 8-11), and a specific larger-volume filter swap (SL7237) with real-world cold-start results. Best for current owners doing their own maintenance.
Posted by an owner-operator (ENGINE BAE channel) sharing hands-on maintenance findings from their own tractor, with a background working at an oil company.
The OEM Kuok J filter is EA0000004647A. Napa Gold 1334 and Wix 51334 (now WL11022) are identical cross references with the same 23 micron, 9 to 11 GPM specs.
The stock, Napa Gold, and Wix filters bypass at 8 to 11 PSI. The Baldwin B227 alternative has a higher 20 PSI bypass, which is fine and won't hurt the motor.
Yes. Switching to the larger SL7237 filter, which has more surface area and volume, stopped the humming bypass noise the owner heard during cold starts.
The dealer charged around $280 for a full kit. Napa Gold 1334 costs about nine dollars and Wix is around 13 to 14 dollars, with identical specs to OEM.
