Does anybody know the proper torque to use on the lug bolts of the W221? Also, what is the correct cold PSI for the 20" wheels on 35 series tires? I know my 18's call for 32, but I believe it is a little higher going to a 20" wheel with lower profile.

 

My cold psi is 34-35 and warms up to about 38.

Not 100% on tq but believe it depends on the lug nut size. I think mine is around 100ft lbs or a little less.

 

The torque should be set at 110 or 115 lbs.

As for the tire pressure, on my S63 the rear is 41 psi and front is 38.

The tires are 275 35 20 in the rear and 255 35 20 in front.

 

Are those the tire pressures that are shown on your gas filler door?

 

Yeah it is....

 

 

Is that from the S65 you test drove? It seems odd that the tire pressure would be different for the S63....unless it was a front end weight issue with the V12 vs the V8.

 

This is from an S65...not sure why it would be different from the S63 though unless the engine weight...

 

This is from an 08 S63

 

Looks like I'll be going with 44 psi all around. Thank you kind sir.

 

Oops... I was off in my previous post. This is what I took from my gas tank off my 2011 S63. I don't know if Canadian standards are different. I think I need to re-check all my tires now.

 

I thought I read somewhere that the wheel lug bolt torque is 95-96 ft lbs. (130Nm)

 

I torqued mine to 100 lb/ft, so I think I'll be good to go.

 

When I go to the dealership for service my receipt says that the tech re-torques my wheels to 115lbs so I was going based off that.