Atlas honda claims its genuine oil can be used for 2000kms and its written on the tin packing "2000km wala". I think we ppl in pakistan chanage m/cycle oil earlier than its life to be on the safe side o/wise there is nothing special in "Atlas honda genuine oil".
so if atals genuine oil can be used for 2000, ill use the oils for atleast 6000 kms as synthetic oils last thrice than the mineral oil.
Besides I also have spent a good amount of money on them.
I came to know this fact of oil contamination (combustion passing the seals and mixing with oil) after I bought the oils.
I think in gs-150 the oils that I mentioned above can be used for a longer period because of an oil filter like car.