Cub Cadet ZT2 goes slow in forward

[tbmmbt]

i have the same machine, my OM reads 10w30 or 10w40 for air temps of minus 4 to plus 90 F , while not necessary due to where i live has air temps reaching above 100F in the summer , i use Kawasaki KTECK 10w40 oil as it still has zinc in it that helps reduce wear in the engine
throttle wise i personally have had the cable slip under the clamp on the engine sevaeral times from my own over gellus pushing of the lever and found both stop bolts ,stopping the lap levers set to far in limiting the forward movement slowing the machine in forward

Been waiting almost 2 weeks for the dealership to change the oil and do a once going over to make sure everything is going good since this would be the first service. I am going to go get my mower and change the oil and filter myself like I always do so what oil filter and number should I go buy. I have always used NAPA Gold filters on my old mowers but unsure what the number is to buy.