is it safe to use 6 month old gas? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

03-31-2008, 03:02 PM

When my car is stored for winter, I use Sta-Bil in a very-very tank.

If I were in your situation, I would drain it too. Can't you just use some rubber tubbing, and drain it out? Try to get 10-12 gallons out. Have 5 gallons of fresh gas to add back. Then go to the nearest gas station ASAP for a fill-up.

Take a good road trip 300-400 miles and use up that fuel too. Then another tank full of fresh gas.

If you notice any problems, use a can of Chevron fuel cleaner with Techron. Do an oil change after the gas treatment.

03-31-2008, 03:06 PM

Oh, I would add a gallon at a time of the 6-month old gas to your daily driving family mobil, as long as it has a near full tank. I really don't think one gallon of "old" gas to 18-22 gallons of freash gas will hurt things much.

Hate to throw away $4.00 per gallon fuel.

Home Depot has nice red 5-gallon plastic gas cans for about $8.00.

renzop · 03-31-2008, 03:34 PM

Geez louize! Throw a can of dry gas in it and then fill the rest of the tank with name brand 93. Then drive it for 150 miles. Wipe smile off face and repeat. Don't worry, be happy.

rick3000 · 03-31-2008, 04:02 PM

I don't know quite as much about this, but if it were me. I would fill up the other 1/4 of the tank with new premium, and then fill up again at about 1/2 tank. I wouldn't worry so much about it. It's not like the car isn't going to run because the gas is old.

tombea · 03-31-2008, 04:56 PM

I'll agree with Rick's assessment. Fill the tank, drive it awhile and fill the tank again. One more time and you'll be home free. You might want to loosen your tank cap, if you haven't already and let the vapors escape before you try to crank it.

xxxalexxxx · 03-31-2008, 05:04 PM

You're fine with the "old" gas. I use to work at a dealership when I was in HS and sometimes cars would be sitting on the lot for months without ever being driven even half a mile so yes they all had "old" gas and all the cars seemed fine.

Tony986 · 03-31-2008, 05:59 PM

Thanks guys, lots of useful ideas. I'm off to get a siphon and gas can and put some of the gas in the daily driver. If I can get 5-10 gallons out and fill it right back up it sounds like I'll probably be in good shape.

If you see a Silver Boxster in Elgin Illinois engulfed in white smoke, don't worry it's not Chong, it'll just be me on the way to Amoco.