As early as the 70’S manufactures were trying to get
customers away from using 4 cycle crankcase oil.
The development of TC-W was to produce a lubricant
to me mixed with gasoline and extend engine life.
As a result of the development of even better additives
(friction modifiers and detergents) today we have
TC-W III.
Formula 50-D has long been replaced.
More and even better products are available today
for cleaner burning and longer life while at greatly
reduced amounts. These products weren’t available
when these decades old manuals were written.
You don’t only drive cars the year you were born.
You don’t only use phones made the year you were born.
You wouldn’t take grandma to the doctor, hand him
a medical journal and tell him to only use the treatments
and procedures from the year she was born. Putting
excessive amounts of oil into our air and water when
it isn’t necessary can have lasting effects on this hobby
that you’ll never be able to reverse.
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.