Hmmm, it’s between the e31 850CSi or e39 M5

E39 M5, had the chance to get one a few years back but knew that as a daily driver it would be a maintenance nightmare so I went with what many auto journalists like Doug DeMuro and Cammisa claimed is an “updated/ more reliable” version of e39 M5, so I picked up a 2015 Chevy SS/Holden commodore SSV instead.

Still want to own a e39 M5 at some point in my life.

SL65 or CLK63 AMG black series

Crank up the heat and turn on recirculation with all windows and doors closed, Crack one window, empty an entire can of Ozium into cracked open window to literally fog the inside of car, close window and let it sit with AC heat recirculating in the cabin for 10min and then air out.

It’s likely their oem plugs are a few steps colder than most regular manufacturers and “colder” rated plugs don’t get hot enough to burn off carbon deposits like normal spark plugs, so they foul up much faster