STP 509A4B - Single Cylinder Engine Tests for Evaluating the Performance of Crankcase Lubricants: Part IV: Labeco L-38 Test Method

STP 509A1B - Single Cylinder Engine Tests for Evaluating the Performance of Crankcase Lubricants: Part I: Caterpillar IG2 Test Method

STP 509A2B - Single Cylinder Engine Tests for Evaluating the Performance of Crankcase Lubricants: Part II: Caterpillar IH2 Test Method