I've had my Bonneville GXP for about four month.The first chance I got I changed the oil,I don't know what the dealer put in it.For the last few years I changed all my cars oil to Royal Purple with Royal Purple filters with no problems at all.Runs great,very quiet.

Yea mines on the window .Sorry can't help.But it does sound like the liner has to come down.

That is so true he says he can but once in there can he make a diffrance.As for cai I talked to a guy from spectra when the good guys wr in Columbus Oh and he said to take pics from under the hood and pics of the intake system taken apart and show off the car take measurements.I don't have his web ...

I might have a diffrent set up or we are not on the same page.My antenna was stuck to the back window.When you say it's loose do you mean the mast or the base.If it's the mast there is a set screw that you can tighten if it's what i'm thinking of.

Hey thanks that something.I do have a company close by that said he can do a tune which should bring out some power I just to get in there and do it.

Hey guys, boy do I have a problem.Here it is, the lights on my wifes aurora will blink off and on with out the key in and theres a noise that comes from under the dash sounds like its right by the steering column.The head light module has been replaced and it quit for a while and now its back ...

Hey all new here just bought my first 04 GXP Bonneville and I love the car it's a blast to drive. The thing that really bugs me is that there is no performance up grades,not that I can find anyway

performance up grades on the northstar in a 04 bonni gxp any ideas at all please!!!!!!!!!!!!!!

My on star antenna was missing also when I bought my GXP so I went to the salvage yard and found all GM cars that had an on star anntenna and snaged all I could find that way I would not have any problems with it.Well I did find two complete anntennas and one extra basesome 3m double face tape and ...

Hey guys I'm new to the forum,just bought an 04 Bonneville GXP dark ming blue 81000 mi great car fun to drive.The problem I just found out about is that after it rains I get a big puddle of water on the rear passenger side,it looks like it comes out from under the front passenger seat :banghead: I'm ...