So I am going under my new toro Z557 (47 hours) to lube all of the joints. As I am looking for one of the ones under the engine, I notice my hydro oil filter is all oily. So, I proceed to check the hydro oil level and notice it is low (not terribly, just a little below the "Cold" line. Then I see that my garage floor has a nice present of hydro oil waiting to be cleaned up. Now, this is an hydro oil filter seal leak. I have to replace the the filter. Will the oil drain out like an engine oil filter will? How do I go about fixing this? Do I have to bleed the hydro system now? Thank You!!