[Fr. Frank]

I found the new 6.2L 300ho Merc for $11,300 plus installation, plus cost of extended warranty from 5 to 8 years. Mercury will not give you a quote on the warranty beyond 5 years without your submitting the serial number of the motor to them.

Know up front that the Passport extended warranty is actually (legally) an insurance policy, with deductibles, sold and backed by Brunswick. If you purchase it through your installing dealer, that's good.
If you purchase it after installation directly From Mercury, many dealers will try to tell you something is not covered, when in fact it can be. This is because they make considerably less money doing repairs under these warranties.
I bought an extended 1 year warranty for my 2011 90 Etec, purchased this past June. The dealer is a friend of mine, and recommended this particular warranty/insurance policy.

My dealer's normal retail labor rate is $115 per hour.
This particular insurance company pays him only $63 per hour for labor done under this warranty, and I have a $100 per-incident labor deductible.
And for work done under the original Evinrude extended warranty offered with new motors, the reimbursement rate is only $51 per hour.

This is why many dealers will try to tell you a particular repair is not covered under warranty. They get more than $50 hr more for retail than for warranty work.

And that highlights well why is important to have a good relationship with anyone who works on your boat or motor.