"Gfretwell" wrote in message
...
I got a Mercury 15 HP 1999, I want to change oil of the lower gear unit.
But
I am not sure which oil to buy,

It is basically 90w but the oil sold for lower ends is supposed to have
more
additives to deal with water intrusion. Since the price is competitive,
why not
just buy lower end lub? The various "X" marts usually sell the Lubrimatic
and
Penzoil types.

Another vote for this idea. Don't dick around trying to save money or a trip
to a store that sells the right stuff. New motor: $1700-$2000. Do it right.