VW 502/505 is based on ACEA "A3" standards for gas engines and the older CMCC "PD-2" standards for diesel engines and also includes the following tests in VW engines: The VW cam and tappet test, "PV5106" is run in the 1.6L IDI diesel engine. The VW T-4, "PV1449" test is run in the 2.0L Vw gas engine. VW C+T/PV5106 Test Parameter Test Limit Applied Load - 1800 Newtons Scuffing - None allowed Max Tappet Pitting - 20 microns Max Cam Pitting - 20 microns Max Tappet Wear - 100 microns Max Cam Wear - 75 microns VW T-4/PV1449 - test duration is 248 hours and no makeup oil is allowed during this test. VW T-4 is considered to be a very severe test for oxidation and thickening.... EOT Kinematic Viscosity @ 40C - 194 Cst max Viscosity Increase @ 40C - 121% max EOT TBN, mg KOH/g - 4.7 Ring Stick - none allowed Piston Merit - 1.0 minimum Note: "EOT" = End of Test I should add that VW 502/505 requires a HT/HS viscosity for new oil of at least 3.5 Cp @ 150C/302F. However there is NO requirement to measure this parameter after the test is run.