Q. After how many kilometers engine oil should be changed in Royal Enfield Classic 350?

I am using bullet 350 since 2018 PLEASE PLEASE DON'T WASTE YOUR HARD EARNED MONEY TO BUY IT . CITY DRIVING WILL MAKE ENGINE TO SOUND KNOCKING AT LOW SPEED IT'S TO MUCH VIBRATING. EVERY THINGS IN IT IS COSTLY AND VERY COMPLEX TO MAINTAIN. MY LAST VEHICLE WAS KARIZMA R IT'S TOO MUCH BETTER AND COMFORTABLE I MISS IT. 350 CC CAN EASILY BELOW ANY 110 CC BIKES IN ROAD. THE ONLY BEST PART IS IT'S GOOD IN HIGHWAYS AS 80 KMPH CAN BE MAINTAIN EASILY BUT IF YOU CROSS 105 THAN AGAIN YOU WILL START REGRETTING ON YOUR INVESTMENT

According to the new norms, every 5,000 km or six months, whichever occurs earlier. The previous recommendation by the company was 3,000 km or 3 months.

If it is 15W50 Semi Synthetic oil 4000 - 5000 km is recommended. But it also depends on the weather and how much you ride and how fast you generally go. For semi synthetic oil change it at 4000 km, for normal oil 2500 km, if you want your bike to last long that's it.