Hi,
I guess he is referring to dino oil as in dinosaur era oil instead of synthetic oil.

Only use Mobil 0-40 per MB recommendation. If they put in in regular 10-30 oil then replace the oil and filter ASAP.

Order the key from the stealership with your VIN.

Do searches on these items and the info from this forum will answer most of your questions.

Enjoy the Crossfire but since it is mostly Benz parts, maintenance can get expensive.