Hi brother, i understand for what you worry about. It is good to compare and choose wisely before you buy something. Actually it depends on the promotion given by castrol malaysia.. Some time castrol malaysia give freebie. but currently they change to contest which you could win ticket to south africa from january to march. You can check the event from castrol malaysia website. The reason why i slow in restock for this few months is because most people prefer freebie.. i not dare to carry much stock for this batch due to that reason..

Actually there is another way to check whether the oil is genuine or fake, you could see the label on the bottle and check the batch number. different batch has different number, the bigger the better..

FYI, i got many castrol freebie inside my car which include few types of umbrella, toy car and t-shirt for sure not keep inside car.. anyway, I use the oil for my car also, tested by myself before selling it.