I just picked up an eXmark 48" walk behind mower. I believe it's a 2000 model. Anyways, it has a Kawi FC401v 13hp engine on it. I am wanting to change the oil and filter on it. Already did the hydro oil the other day. I only found one filter for it, a K&N KN-128. Are there any alternatives? I've had good luck with putting FL910 filters on Kohler engines, but never had a Kawi! Also, oil. What would you guys suggest? 10w-30 or sae30? Something else? It didn't come with any kind of owner's manual. Thanks!