It's been very frustrating finding the appropriate engine manuals.
Briggs and Stratton have nice menus to find your engine based on some part number but that seemed to be focused on integrated designs and I never was able to get the right manual from them.
Eventually I found pdfs of similar models in google searches.
Even then they're not the most useful.
For my future reference it seems that 0.5 quarts for the lift engine and 0.7 quarts for the thrust engine are the appropriate amount of oil.
