Polaris 2008 Ranger RZR - Manual (Page 57)

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OPERATION
Vehicle Break-In Period
The break-in period for your new Polaris vehicle is the first 25 hours of
operation, or the time it takes to use the first two tanks full of gasoline.
No single action on your part is as important as a proper break-in period.
Careful treatment of a new engine and drive components will result in
more efficient performance and longer life for these components. Per-
form the following procedures carefully.
CAUTION
Excessive heat build-up during the first three hours of operation will damage
close-fitted engine parts and drive components. Do not operate at full throttle
or high speeds during the first three hours of use.
Use of any oils other than those recommended by Polaris may cause serious
engine damage. We recommend the use of Polaris Premium 4 Synthetic Oil
for your 4-cycle engine.