I like to raise my rear tire off the ground and when it’s full I turn the wheel slowly and then it takes more. I also use Redline Heavy Shockproof. Been using it since 2015 in both slings
I have a 2018 SL my book says to change it at 500 miles, I changed it and used 75/140 Royal Purple as many on the forum has advised. Glad I used the Royal Purple there is a lot less noise from the angle drive now, I also installed the magnetic drain plugs in the engine, trans and angle drive, This forum gives out some good and useful information. Thank You.