i need to change my oil today cause i want to go to the track tomorow, was planning on doing it tuesday but its already been about 4k since my last change anyway i have motul in there now full synthetic in there would it be safe if i just put mobil 1 or castrol synthetic or is the mixing not good i know it might be considered a noob question but let me know

 

Your fine if you switch brands for your next oil change.