Just got a new Honda Civic. I had oil laying around that belonged to the car I traded in. I replaced it to the owners manual (optional) specs, as the standard factory oil is semi-synthetic. My GTI used synthetic always...(don't roll your eyes.) When I told my the service guy I would provide my own oil. He warned me that the new engine would benefit from using the factory fill oil because the parts needed to settle into each other. Smells like [censored], but made sure his tone had air of expertise. What do you think. I want to use Mobil 1 0w20 Advanced and other service adviser vouched for his "expertise". What can you tell me?