Steve, I agree, check your receipt. Some of the new filters are the exact same color as the original factory filters. Same gray color. As a technique, because believe it or not, I've run into this before. I write the date and the hours on the new filter just to provide the cust. with a warm fuzzy that the filter was actually changed. Granted, just because I wrote on it does'nt mean I changed it. Just like on the new tractors that come through, just because someone marked a hyd. hose as tightened, realy does'nt mean that it was. I find alot of loose fittings that were supposedly tightened at the factory and marked. I've seen some people also complain about "grease dripping off of there grease fittings". Well there's a reason for that too. In school the proper procedure for greasing is always, wipe the fitting off, then grease till you here or see grease overflow then stop. Then wipe the fitting again. Well after doing it the way I was trained a few times, and being accused of not greasing the machine "properly" I promptly learned to over-grease and leave as much slop as possible to provide "proof" that the machine was really greased. Just trying to provide some insight from my point of view. If the receipt shows that the fluid and filter were changed, I'd tend to trust it. If you still need convincing. Go to the parts counter and ask to see a new filter in the box. I have a feeling that the one you are talking about will be the same color. If not, then someone is BUSTED. The black filter you mentioned should be the engine oil filter, could also be white or gray depending on what kind of mood Kubota was in that day. Kubota filters seem to change as much as the weather. You have every right to be concerned and I'm definitley not trying to argue with your concerns. I have read here that there are some dealers that are "alot smarter" than the engineers that wrote the service intervals, and don't change the hyd. oil and filter at 50 hours.