Iv been using Hess for my X and ran perfectly fine with it without any issue. i leave the car off and fuel like ur suppose to. but when i go to Shell my engine light seems to go off after a couple of days after i fuel. and mobile does that to my car too. is it the gas? or maybe my engine light fuse is giving out? just seems so strange, i use 93 octane on all the 3 gas pumps and hess never gives me any engine lights. any thoughts?