In my opinion the thing is, on high temps a 5w40 is getting to thin, so the savety oilfilm isn't thick engouh and strong, result is losing oilpressure.
I don't know which Mobil1 Rally you got in the U.K., is it the same?
Ours got the best additive package, a really high viskoindex, a extreme high HTHS-value, only Castrol RS 10W60 and some pure racing Oils from Motul, all these aren't longlife oils got higher values, instead of beeing 15W50 20W60.
Also a high flamepoint.
I dont want to spam, I am open for new theorys, please explain what you are missing on Oils like these?
Because I always thought thhese specs were relevant, when pushing the 16V to the maximum.
Greetz Robert
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