I would go to guess most of the 6 liter guys know that snap on makes a 24/36 socket that will help you with your fuel and oil filter caps. If you didn't know I thought I would post this. I know I got mine for 30 bucks from my snap on man. Sounds pricey for one socket but after trying it with channel locks NEVER again!!

 

A 15/16 and a 1 7/16 socket have worked fine for me.

 

The 36 mm is a short socket made by Lisle and sold at Pep Boys for under 10 bucks.