"Short Wave Sportfishing" wrote in message
...

we recommend the use of Mercury Precision 4-Cycle 25W-40
Marine Engine Oil. This oil is a special blend of 25-weight and
40-weight oils for marine .

What crap! If you blend 25 and 40 weight oil you don't get 25w-40 you get
an average viscosity of the two oils based on their ratio. MM's 25w40 is
formulated the same way everyone else's mulit-weights are. They start with
a base 25 and add polymers (assuming that it's dino oil).