What coolant do u guys recommend for a car that's mainly driven on weekends and some autocross / HPDE? Do I get benefited by going aftermarket coolant, e.g. Motul?

Thanks in advance

 

You can just throw some Motul "MoCool" or Redline "Water Wetter" in your regular coolant. I seriously doubt autox even in summer temps stresses the stock cooling system much. HPDE is another story, it would depend on how hard you're driving, ambient temps, and the session length.

 

RP purple ice or water wetter into your regular coolant will be good enough!