I have a 2005 S430 and I would like to replace the rear tail light and signal light bulbs for LED. I know for the signal bulbs I will need resistors or perhaps I would replace a new proper Flasher Relay. Do you think the tail light bulbs will be OK without the resistors since they use less energy. Perhaps after replacing the rear, I would most likely do the front turn signals as well.

I like the refresh rate of the flashing and instant turn on. How do you guys feel about these?

They all need resistors as mb will show taillight out or signal out etc

"Do you think the tail light bulbs will be OK without the resistors since they use less energy"

It's the lower energy use that makes the resisters necessary. The system reads the lower current draw as a burned-out bulb, hence the error message.

You will need resistors.