What weight Mobile 1 Synthetic oil is everyone using?

0W30...but if I could find 0W40 Mobil-1, I'd use it.

I USED 5W-30.

And I am sure the new owner appreciates it. ;-(

Follow the owners manual recommendation.

Gas mileage drops a hair with the 0W40.
 

I was using 10W30 prior (which should be the same as 0W30 when warm), and I lost about 1-1.5 mpg it seems. I'll probably end up switching over to 0W30 for winters, and keep the 10W30 for summers.

Yup, I feel good knowing that they'll have years of driving enjoyment!

0w40 mobil-1

0W-40 Mob1 synthetic.

Another "Oh Dub-Ya-Three-Oh" here but will switch to "The Forty" when the "Three-Ohs" all used up.