Good day everyone, I have always used 10W30 Mobil1 Synthetic in my E36 328i engine. I would like to switch to a heavier grade, but Mobil1 one only has the 15W50 Synthetic that is higher. Is this recommended in my BMW? I heard from my mechanic that 10W40 is recommended... Any ideas? Many thanks and a great weekend to all! Serge -97 e36 ------------------------------