Lifetime Premium Member
Date registered: Sep 2008
Vehicle: 1997 E-420 (150K miles), 1997 SL500, (90K miles) 2015 GMC Sierra Denali 2500HD CC/SB/4x4 Duramax
Location: Portland, OR
Mentioned: 14 Post(s)
Quoted: 377 Post(s)
Run Costco gas in lots of vehicles including my E420, when it's handy, and have never had a problem or noticed any difference in performance or mileage. Now I wish they also had Diesel, at least in my area only regular and premium, no Diesel.
Personally, I think many of the "must have used cheap gas" reasons from mechanics is because they don't know the real reason for a failure and want to tell the customer something.
You probably run a bigger risk of problems when you buy gas from a small station with low turnover and end up with water and/or dirt in the fuel.
97 SL500 Imperial Red/Parchment Leather/Black Top
Chromed OEM wheels, Akebono's, H1+90 fog, Burlwood/Leather shift knob, Rostra Lumbar support, Check seat heaters, Bilstein's, Parrot Bluetooth, GG Bailey Custom cargo mat, GG Bailey trunk mat, Real Burlwood Instrument Cluster w Chrome rings, Burlwood & Chrome shift surround, Euro headlights with Osram 70W/65W H-4's, clear corners, Silverstar corner lamps, Euro Trunk mount Warning triangle, SL600 Burlwood armrest trim & Burlwood cupholder sliding cover, Kahtec flashing third brake light (CHMSL)
97 E420 Royal Indigo/Grey Leather
Raintracker wiper, Rostra Lumbar support, Parrott Bluetooth, 17" chrome AMG replica wheels, Bilstein's, Akebono's, smoked marker lights, Osram 65W H7's, H1+90 fog, Rear Seat Child restraint Tether, Burlwood/Leather shift knob, OEM Mudflaps, DRL's, Becker Aux input
Last edited by e-420; 11-12-2009 at 11:01 PM.