[1320racer]

I purchased a 2013 M5 in the summer of 2018 with 46k miles, with a year+ of BMW CPO warranty remaining. Before finalizing on a price, I paid to have a Maryland State Inspection performed at the BMW dealer where this vehicle had had past services and repairs performed. This gave me great negotiating power and saved me thousands of dollars because, to pass Maryland's State Inspection, the vehicle needed new rotors, pads, and tires. Most every item was at, or just below, minimum specifications.

After purchasing the vehicle, I installed OEM rotors with Akebono pads. Search my posts if you'd like to determine where and how much these items cost me. BTW, the BMW rotors were purchased at a great price from a BMW dealer in Atlanta.

Tires:

The Michelin Pilot Super Sport front (265/35/20) and rear (295/30/20) tires were worn out to ~3/32" but were not too noisy and still had okay at grip on the road as long as the road was not damp or wet. If the road was wet, all bets were off and I needed to drive very modestly.
{On from an unknown mileage to 46,XXX miles}

A couple of weeks later, Michelin Pilot Sport 4S front (265/35/20) and rear (305/30/20) tires were installed. Once the new tires were installed it was immediately apparent dry and wet grip had been increased and increased significantly. Unfortunately, I thought the new MPS4S tires were a bit noisy. Now the MPS4S tires have just over 25k (HARD) miles which is incredible! Typically, I manage around 15k miles on premium-brand (Mich/Conti/Bridg) summer ultra-high-performance tires and then they are worn out. These MPS4S tires have great longevity. Now to my opinions on the negatives: (A) they have been a bit noisy from day one (B) after ~15k miles they seemed to tram (find groves in the road) more than the worn MPSS. But this may be due to the fact that the rears are wider than OEM specifications allow. (C) were better than expected to 40-45F, but it is very clear when temps get in the 30s or below, they really should not be used.
{On from 46,XXX to 71,XXX miles}

I just purchased Bridgestone POTENZA RE980AS front (265/35/20) and rear (305/30/20) tires. The main reason I went with the Bridgestone tire is there are just too many cold days where I live. Also, I often take trips to OH when temperatures can get into the 20s from October through April.
{On from 71,XXX to 90,XXX miles and still going}

I will report back my likes and dislikes on these Bridgestone tires. They should be better in the cold but the specs show they are a heavy tire when compared to Michelins. The tire's compound and weight will not help me at the drag strip.