I believe that to qualify for the extended warranty this engine still falls under the same conditions of the rest of the range, despite the self service gimmick. So be careful.
"An Authorized Service Centre * must perform the recommended routine
servicing/maintenance requirements and repairs and log these with Mercury.
The recommended service intervals and main
tenance recommendations must be adhered
to 3mth, 12mth, 2yr, 3yr, 4yr, 5yr
20hr, 100 hrs, 200 hrs, 300
hrs, 400 hrs, 500 hrs, 600
hrs...; whatever comes first. "