Hi all, I usually keep a small bottle of engine oil at home to top-up if needed (Skoda Rapid, 2014, 1.2ltr, 77kW). However, with a recent oil change, the service dealer added a different oil: Mobil Super 3000 Formula V 5W-30 (previous oil was Valvoline SynPower XL-lll 5W-30).
When searching online, I could only find 5 litre buckets of that, which is more then I would need even for a complete oil change... I also found statements ranging from "Yes, you can mix different brands of engine oil" to "You should NEVER ever do that!".
So my question is: can I use a different oil to top-up the current Mobil Super 3000 Formula V 5W-30 and if so, what parameter are important?