I didn’t choose to get the Reverso. My desire to have one less system to maintain overrode my desire for an “easy” fluids change. I have a johnson oil pump which I attach to a five gallon bucket. Works quickly and well for me.
When I change the oil, I place a small oil catch basin on top of a small box below the oil plug. I take off the fill cap, loosen the plug, and suck the oil into the bucket using the catch basin. I remove the old filter, dump the oil from it into the bucket, and dispose of the oil filter. I fill the new filter about 3/4 and put it on the engine. When filling the engine with oil, I fill to the bottom of the hatched section of the dipstick tube, and then start the engine. I take the five gallon bucket to the auto parts store for recycling. When I get back, the oil is usually 3/4 of the way up the hatched section. I pour a small amount in to get close but not all the way to the top of the hatched lines. The first time I filled the oil, I had to remove 24 ounces of oil, due to the time it takes for the oil to settle.
The transmission is a little more problematic. I remove the filter in the transmission from the front starboard side of the engine and replace. I remove the trans fluid through the dipstick from the back, and then refill through the dipstick. Works ok, just awkward to get to with the batteries right there. I then engage the transmission, and fine tune the fill.
The Northern Lights generator is a little messy because the filter is on the side and the gennie has two fill caps. If I remember correctly, I pulled the oil from a supplied drain tube using the Johnson pump. Pulling the filter is messy, because it sits sideways. Using absorbent towels minimizes the mess. Replace the filter. The next trick is to use the top oil fill. Using the side cap can cause the oil to pour out by the funnel. I fill to half the hatch mark, started the engine, and then rechecked to fine tune. Then, let it sit and check capacity