USED PARTS WARRANTY - Unless sold otherwise, engines have a 30 day warranty from the invoice date that covers knocks, cracks, and excessive oil usage. Only replacement parts are covered, not labor cost of replacement. If a part can not be replaced a non-transferable refund will be issued to the original purchaser. Warranty claims must be made within 30 days of original invoice. Refunds/replacements must be approved in advance by authorized personnel of K&R Truck Sales, Inc.