AN INDIAN EXPERIMENT

THIS paper describes a test method, developed on the Kirloskar AV‐1 (naturally aspirated) single‐cylinder diesel engine, for evaluating tendency towards detergency, ring sticking and accumulation of deposits in heavy‐duty type lubricating oils. The repeatability, reproducibility and the discriminating ability of the method is found to be good when the engine is run under the prescribed test method for 120 hours. This method is likely to be included in Indian Standard Specification for IC Engine Lubricating Oils, IS : 496. To finalize this test method, a correlation programme was also run between five laboratories. The results obtained correlate with the Petter AV‐1 test procedure when using a fuel containing 0–4% sulphur.