These are halogen bulbs and may not be touched by hand or by any thing with oil on it, or they will burn out very quick. If this is not the problem look for something loose that maybe cause extra vibration to the blub causing it to fail.
The Polaris sportsman 500 was available in 2 cycle and 4 cycle engines. Therefore the specifications are listed separately.
Ask the dealer
2 quarts with filter change
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4 stroke
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A 1999 Polaris Magnum 500 typically requires 10W-40 synthetic or petroleum-based oil for its engine. For the transmission and chaincase, Polaris recommends using their own Polaris AGL oil or an equivalent that meets the specifications. Always refer to the owner's manual for the most accurate and specific recommendations for oil types and capacities.
Check and see if it has the same model number. If it has the same model number it should fit.
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I just got a free copy from my local dealer.