Been using Millers 5w30 fully synthetic religiously and now running over 400bhp would anyone recommend a different type or brand? Do notice the oil temp levels hover around 100°degC when pushed a bit.
Ps. I have a FMIC but no uprated oil cooler.
Thanks for any replies from now 👍

 

100C is nothing, I used to see 100C in my FSTi that was running 320bhp or so.
I'd speak to the mapper but personally I'd use 10w-40 in a standard car or 10w-50 in a modified car, especially if you do trackdays.

 

Also oil pressure goes too low for my liking once heated

 

5w30 is too light regardless, personally would be using 10w50 or similar......

 

would this grade keep oil pressure high even when heated as once its heated it goes low with 5w-30

 

 

i use millers 10w 50 nanodrive for my forged

 

I’ve had good luck grabbing quality fluids from https://www.coxmotorparts.co.uk/hond...a-oils-fluids/, so I’ve stuck with the same approach for my own builds. For a healthy EJ207 running your power, I’d go 5W40 for daily fast-road use and move to 10W50 if you’re seeing high temps on track. I just change it every 3–5k miles and keep an eye on temps and pressure.