What air pressure are you running in SL63?
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Junior Member
Joined: Jun 2018
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SL 63 AMG
What air pressure are you running in SL63?
Door states 46 front/48 rear psi, but I think that's too high for routine driving. What suits you best? Air Pressure notice just came on and this is the first time I'll need to inflate them. Thx!
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Joined: May 2009
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From: Laguna Niguel
'94 SL600,'05 SL600,'06 S65,'07 E63,'14 E63S,'09SL600 all sold, ‘15 S65,‘18 E63S,'17 SL65, '17S65Cab
I have a 2017 SL65 but the pressures should be similar. There are four choices depending on load and maximum planned speed. Not over 155 with 2 passengers is 35F/33R, with maximum load it is 36F/36R. If you plan on diving at 186mph it is 44F/42R with 2 passengers, 48F/46R with maximum vehicle load. The sticker is on the gas filler cap.
After some experimentation I settled on 39F/36R for more responsive steering with good ride quality. But that is with the V12 up front.
After some experimentation I settled on 39F/36R for more responsive steering with good ride quality. But that is with the V12 up front.
Last edited by Quadrobenz; Aug 1, 2019 at 02:57 PM.
Thread Starter
Junior Member
Joined: Jun 2018
Posts: 42
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SL 63 AMG
Great; thx! It's strange they'd list it like they do inside the door; just creates confusion. I'm going to start by trying 37/35 due to tires not being cold when I get the air. 'preciate it, and nice ride btw!!!
Super Member
Joined: May 2009
Posts: 810
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From: Laguna Niguel
'94 SL600,'05 SL600,'06 S65,'07 E63,'14 E63S,'09SL600 all sold, ‘15 S65,‘18 E63S,'17 SL65, '17S65Cab
Sorry about the typo above. I meant to say SL65. I do also have an S65, that gets 45psi in the front tires.
Let us know what pressures you end up liking in your SL63.
Let us know what pressures you end up liking in your SL63.
Thread Starter
Junior Member
Joined: Jun 2018
Posts: 42
Likes: 5
SL 63 AMG
Turns out I have a bad tire pressure monitor. Air pressure was at 44 on all tires. Once I confirmed this is a maintenance item (bad sensor), I lowered all 4 tires to 40. It was running hard over bumps and now I know why.
Super Member
Joined: May 2009
Posts: 810
Likes: 182
From: Laguna Niguel
'94 SL600,'05 SL600,'06 S65,'07 E63,'14 E63S,'09SL600 all sold, ‘15 S65,‘18 E63S,'17 SL65, '17S65Cab
44psi all around would be harsh in normal driving. Too bad about the bad pressure monitor. Since you are using the in-car monitor for the pressures they are usually accurate but will not measure the tires cold as you pointed out. I have a compressor in my garage and several accurate gauges so all my readings are cold in the morning after sitting all night. Suggest you drop the rear tires a couple of psi. The car will ride better and handle slightly more neutral. I hope you find the ride more reasonable now.
