When Johnson specified SAE#40 for their outboards
it was all that was available at the time. The development
of TC-W oil was to have better product designed to be
mixed with gas for better lubrication and longer life.
As early as 1971 they were recommending TC-W oil
at 50 to 1 to be used it the earlier motors and not to
use crankcase oil except as a last resort. The
development of TC-W oil has continued so we now
have TC-W3. How people can sit behind a computer,
with a smart phone in their pocket in their pocket,
in their air condition home and then look to a manual
that is 60, 70, or 80+ years old as the best source for
the care as far as lubricants is something I cant
understand. For those of you who rely on that decades
old data let me try to bring you up to the 70’s anyway.
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.