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Harsh emission control regulation restricted the sulfated ash, sulfur and phosphorus (SAPS) level in passenger car motor oil (PCMO), thus lubricant industry need to find new additive to partially or wholly replace Zinc dialkyldithiophosphate (ZDDP), which has been used as an antioxidant and anti-wear agent for several decades. Overbased crystalline calcium sulfonate (CCS) detergent comprises calcite calcium carbonate and this structure might be useful to improve the anti-wear property of engine oil in severe lubrication condition, especially for PCMO with lower SAPS level. Frictional characteristics were studied between overbased amorphous calcium sulfonate (ACS) detergent and CCS and their interactions with dispersant and ZDDP by Mini-Traction Machine, which is often used to measure the Stribeck Curve of lubricant.