I run the mobile 1 synthetic, I am pretty sure it is under 10 a bottle. Can't remember though. I run the heavier stuff for towing and would recommend it if you have bigger tires and/or tow. My big reason for using synthetic is that it doesn't smell as bad as the dino gear oil. I use the dino gear oil in my truck and it stinks up the garage for days it seems like.

Reminds me, it is probably time to change mine again. Been towing a lot this summer.