Don't shoot me! Oil question.

[Tomikaze]

Hey guys. Still treading lightly over here at 986forum. Yes, I did a search first. Found many threads about the general subject but not one that answered my questions. Seems the oil questions come up often just like they did on the last Miata forum I was part of. Before someone rants all over my party... let me ask the question this way... I will be doing my first oil change this weekend. Any tricks I need to know about? I got my filter, new plug and washer but no oil yet. I've always used Mobil1 in all my cars. I read the owners manual and saw a list of approved ratings. It asks you the average temperature and then gives 3 or 4 ratings. I settled on 10w-40 but the only M1 I could find in 10W40 was a high mileage oil. Sorry to be long winded but now to the question... if you're using Mobil1 which rating are you guys using?