Engine oil.

[fdiaz18t]

What brand and grade do you use?

[BAMBAM]

Mobile 1 is the BEST and use 10-30 in the winter and you can go thicker in the summer.
That is what I have used in my nine sec mustang and this car. Just my two cents

[fdiaz18t]

I use Mobil 1 too, but 10-40 because in here is summer all year long (80-90 degrees).Some people recommend me 20-50 for track days but I didn't try yet.

[turbolarry]

Mobil 1 10-30
Basic mods for 30K+ miles and no problems.