what is the best 4T synt oil you have used and why?

[Val]

ok guys what is the best 4T synt oil you have used and why?

IME sometimes you put good oil and you hear the difference I mean the engine sound is smooth, sometime you put wrong oil and is all knocking around.

I am happy with Silkolene comp esther now, but is this one Motul 300V way better?

Looking at tech specs I see viscosity is much higher:

https://www.motul.com/system/product_des...1383162290

Anybody used Fuchs Pro 4 plus 10W-50?

http://www.fuchslubricants.com/pro-4-plus-10w-50

http://www.opieoils.co.uk/p-911-motul-30...ester.aspx