I’ve searched the forums but I’ve yet to find if Pentosin 5W40 or a Motul 0W40 8100 max oil analysis test? It’s going in a Mercedes with an M113K supercharged V-8. I’ve been using 0W 40 from Castrol but I just used the Pentosin 5W40 and it feels like my engine is quieter and smoother but I’m trying to take advantage of the FCP Euro lifetime guarantee before November 1 when they change it And they dont have the Pentosin 5w40 but Motul is 100% synthetic.