I recently got the service done and using the company recommend Normal engine oil instead of semi or full synthetic oil. Car was driven about 1200kms after the engine oil and is currently at 29500kms only. So fairly new engine. Poured about 140ml of this oil treatment on cold engine and then let it warm up. Noticed the engine smoothness immediately,drove for about 30kms after it and engine revvs happily. Must say its working great. Will surely recommend. Note: the oil level looks half in the can but when u measure it in flask,u will get approx 180ml for sure,as the oil has high viscosity hence it sticks to can walls too. I used the measuring beaker and it was approx 180ml for sure.