Polaris 900 RMK - Manual (Page 63)

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OPERATION
Engine Break-In
No single action on your part is as important to long, trouble-free
machine life as proper break-in of a new or rebuilt engine. Premix the
first tank of gasoline with one pint of Polaris injection oil for each five
gallons of fuel. This, in addition to the lubrication supplied by the
injection system, will assure proper engine break-in.
CAUTION
Excessive heat build-up during the first three hours of operation
will damage close-fitted engine parts. Do not operate at full
throttle or high speeds for extended periods during the first three
hours of use. Vary the throttle openings and machine speeds to
reduce friction on all close-fitting machined parts, allowing them
to break in slowly without damage.
Use of any lubricants other than those recommended by Polaris
may cause serious engine damage. We recommend the use of
Polaris lubricants for your vehicle.
Drive with extra caution during the break-in period. Perform
regular checks on fluid levels, lines, and all other important areas
of the machine.