Just put 600 miles on my new GLE 53. How careful do I need to be? Can I push the car hard now/is spirited driving okay or should I wait for longer? I’ve been driving fairly normal up until this point (between 50-65mph, half throttle max).
Also, would an oil change be helpful now? or is it an overkill and I should just stick to the 10k-12k mile interval?

 

Just follow break-in instructions on the sticker at the top left driver side of the windshield and you are good to go.

 

Some might suggest and I am one of them, with a new engine change the oil a few times during breakin. In my CLE 53 I changed at 1000, 3000, and I plan to change at 5,0000. Then 5,000 after that.

 

+1 Take it easy on the engine at first, vary your speed and refrain from holding it wide open for too long during the first ~300-500 miles. Once past that and the 1st oil change, drive it as one normally would do so.

Opinions vary on oil changes during break-in, but I agree with this or some version of it. ~250 - 500, 1500, 3000 miles and then every 5K or annually for the oil changes.