P1000 Rear engine oil reservoir capacity question

[100Acre]

How much oil is held in the rear reservoir for the engine oil? The other day when I change my oil I screwed up and drain the sub trans and the front or middle engine oil reservoir. I only discovered my mistake yesterday and had fixed the overheating and noise problem it was creating in the sub trans by adding the appropriate amount and type of oil, but today when I went to just go ahead and change the engine oil again, I drained the rear reservoir and nearly a gallon of oil came out and when I tried to change the front reservoir for the engine oil bolt started stripping and I cannot remove it so now At this point I am trying to just add oil or figure out how much was in there or not. My main question now is how much oil is typically held in the rear reservoir? Thanks

 

[Admin]

 

[HondaTech]

The two drain plugs in the enigne (12mm heads) are draining the same oil, there is no separate reservoir between the two. I would figure out a way to get the oil pan bolt out or you'll never drain all the old oil out.