Stick with a high quality 10w/40.
thanks for confirming that, i did think recommending 5w 50 was strange
been reading... Lots and found some decent stuff. Motul 300v 10w 40 fully synthetic double ester
people highly rate it.
apparantly esters are very resistant against extreme pressure and heat making it perfect for oils
one guy did a track day in his 350z on his normal oil and took down the average pressure and oil temp readings
he then drained and refilled with the motul and found pressure to be slightly higher as well 8 degrees lower temps
he also found that cool down was much faster when leaving the car for a few minutes in between breaks on the track
its double ester fully synthetic so it cleans the engine 30% better than semi synthetic
also esters are molecules and have the capability to stick to metals when the engine is off and providing maximum protection during start up
ester are virtually shear proof. What that means is even in oil temps that peak to 150 degrees and 130 running temps. It will still remain in its viscocity range and wont break down resulting in oil pressure drops (so will sort that buzzer going off under hard cornering)
Also this may sound insane but people have run dyno after dyno on cars with standard semi synthetic and the without moving the car, changed the oil to 300v and run another 10 dyno runs and on average found a 16hp gain, that was on a 365bhp mustang though
though its not all benifits, being ester oil it has to be changed more often. Every 6k depending on driving, and when its £70 for four litres!! But i dont mind paying that, even if mine is my daily
im going to be sending my current qauntum oil off to blackstone labs for analysis and see what my engine wear levels are then do a run on the 300 and send it off
thought you might be interested as it sounds ideal for your turbo tracks days robin as you do hammer that crap out of it lol
Taylor
