From natural gas compressors to landfill methane powered generation sites, spark-ignited gas Caterpillar and Waukesha engine equipment owners have learned that IPD engine parts provide OE-level performance at a lower cost. Spark-ignited gas engines must perform consistently for many years under constant load and high operating temperatures. Only quality parts like IPD will meet these demands year after year, and provide the total engine service life that you expect.