RK37 Owners Manual - Oil Recommendation 10w-30 vs 10w-40

[MoccasinGap]

Hey All, so I am looking in the owners manual for RK37 it states using (API CJ-4 SAE 10W40). But on the Maintenance Product PDF it gives a sku number for King SAE 10W30 All Fleet Heavy Duty Engine Oil 1 Gallon. I just want to stay in warranty. Or I am just reading it wrong which may be true also.

 

[Ishkatan]

Do you have to buy RK filters and fluids or can you get other comparable items? I would think as long as you have receipts to show you bought the materials it would stay under Warantee. But check with RK service. I will be when I get my tractor and it has close to 50 hrs. on it.