Originally Posted by Omotesando
Sorry I didn't know u posted that, I got confused while skip-reading! I thought it was from the person who posted about 10W-50 for some reason whilst reading up other things at same time. U can disregard end part of my previous post!
Anyway, if you go on track - 10W-40 is probably recommended by people as it has better, thicker protection film. Though without Oil Pressure and Oil Temp measurement, also depending on how hard u drive on the track, etc, its hard to say whether 10W-30 or 10W-40 is better, even if ppl commonly suggest thicker viscosity on the track? I mean oil is for lubrication. As long as no metals are touching then the thinnest, more lubed alternative should be best. That's why thinner oil has better fuel economy and more power, less oil pressure. What I'm worried about is, on a Honda engine whether the thicker oil can run around to the smaller parts fast enough to protect them too, at high RPM?
If I go on track - I'll take away the number plate to make sure there is enough cooling to the radiator.