I did engine oil and oil filter change today on Kubota B2620. Bought in 2013, has 250 hours. Apparently this is the first oil filter change bc the attached filter was grey. Probably the 1st oil change also, I sent it for service in 2015 but not sure what exactly they did. Well, I poured the new oil without putting the drain plug back. After I realized, I put the drain plug back and poured the rest pint or so oil. Ok this is the stupid part, I drove the tractor for about 30 feet. No load, nothing. I just wanted to park it. I finally found another gallon 15W-40 and put them in and ran the tractor, mowed for about 10 minutes and I think it ran just fine. Prior to draining oil, I used the tractor for mowing for 5 minutes. Do you think tractor is Ok? I told hubby what I did and he was really mad!! Thank you!