Maybe you would like to try an American brand oil what we sell here in the Netherlands called Polytron.
There additive package is quit unique compared with regular oil brands.
Friction goes down en the wear process will go down with 95%.
Even the oil temperature drops 5-20 degree Celsius.
We have also an 5W30 and also a 5W40 oil with this unique formula.
It does not contain Teflon, grafiet, ceramic...etc.
It is used here in the Netherlands also in race cars en go-karts (Dutch championship) the result are much better than with conventional oils
Maybe you can check:
polytron-lubricants.nl (we have a Dutch/English website
If you write in German language it is oke. I understand it....;)