I know it’s subjective, but what is the smoothest oil you have ever used ?
For me it was semi-synthetic Castrol Magnatec 10W30, we get the Euro rated one here, so it was SN & A3/B4. When I ran it in my GM (Opel) Astra, it was so smooth that when I was stoped at a red light I caught myself glancing at the instrument cluster to make sure the engine was still going.
In the same car, I‘m running the full synthetic version right now, Magnatec 5W30 (SN & A3/B4), it’s fine, but not as smooth.
For me it was semi-synthetic Castrol Magnatec 10W30, we get the Euro rated one here, so it was SN & A3/B4. When I ran it in my GM (Opel) Astra, it was so smooth that when I was stoped at a red light I caught myself glancing at the instrument cluster to make sure the engine was still going.
In the same car, I‘m running the full synthetic version right now, Magnatec 5W30 (SN & A3/B4), it’s fine, but not as smooth.