u/K3NCHO

i drove around 2,600km with my s55 since the last amsoil 0w40 oil change

during that period i went on the track 2-3 times for multiple hour drifting, many roll races on the track, heavy street use every time i take the car out, 2 long-ish distance drives where the car sustained 200-250kmh for couple minutes

i planned on changing the oil at 5,000km but i noticed that the oil level got a bit lower. first ~2,000km it was directly ar MAX rading level and yesterday after measuring it showed lower by ~25% in the MIN-MAX level range

would it make sense if i were to change the oil at 3,000-3,500km? or is it not degraded enough to be worth changing sooner than planned?

my car is running MHD stage 1 with downpipes

i injured my spine around 7 months ago. got an MRI recently and i have a 3mm buldge on L4

i get a sharp pain in my lower back when i take a step with my right leg, also same thing happens when i lay down with legs straightened and pull my foot towards me

when walking, if i stand still for a minute or two and continue walking i get sharp pain in my lower back when taking steps. if i sit down for 2 minutes with my back slightly rounded forward the pain goes away and i can walk with very minimal discomfort

no pain radiating in the leg or anywhere else, no numbing as well

what kind of rehab/exercises can i do to make my case much better?

anybody got an upgraded rear sway bar?

what are pros and cons?

which M cars would you guys rank in top 3?

i'd go with:

1. E63 M6
2. E46 M3 CSL
3. F82 M4

i think these are the most interesting and fun to drive M cars

• M6 with the high revving V10 and brutal SMG
• CSL with its lightweight perfect weight distributed chassis and a high revving inline-6
• F82 with its drifting ability, DCT instant shifts and turbo fun

which oil do you guys use for F82 M4? 75w85/90 and 75w140 seem to be ones listed most commonly