XT855 Operator’s Manual Service - 91 2000 Hour p 2000 Hour Change Engine Coolant Drain cooling system at drain (2). Refill (1) with approved coolant every two years or 2000 hours. NOTICE: The use of non-approved coolant may lead to engine damage or premature engine failure and will void engine warranty. See “Approved Coolant” on page 80. for list of approved coolants. CMW