Originally Posted by LugNut
My 2005 XF is detonating!
I don't drive it much, and it did fine on the tank of gas from/during the winter. But then I filled it with the local Premium gas (only 91 octane here) a couple of weeks ago, and soon got detonation.
I've been reading the related threads here, and elsewhere. Sounds like at least two things: 1) warmer/less dense air, and 2) low octane.
Adding a jar of lower-cost octane booster only slightly reduced the problem.
After reading a thread here, I'll now add a bottle of gas-dry and check the error codes (no warning light showing now).
Could have been bad gas from the BP station. Insert BP jokes here ...
Other ideas?
I would guess a bad tank of gas, unless it continues after you fill up again. Octane boosters barely raise the octane rating of any gas. While it may help a little, be sure to add some gas treatment. I wouldn't go back to that station. Might want to report them to the Department of Agriculture too. The number is on the pump. They are the ones that regulate the weights and measures of gas pumps in the US. Who knows, maybe you'll get reimbursed for your bad tank and any damage it might or may have caused. They could/should get shut down, or at least fined.
EDIT: Little tip. BP uses the lowest quality and lowest amount of detergents that is legally allowable in their gas. Look up on toptiergas.com and see if there is any of those stations around you. They use detergents that are above government mandated standards, that way they help prevent carbon build-up in your fuel system (injectors, etc.) better than stations like BP and Citgo.