View Full Version : Help! Fuel Octane 91 for G20?

01-14-2003, 10:26 PM
My dealer here in Ottawa, Canada told me that I should use regular unleaded fuel of octane rating higher than 91 for my 2000 G20t (basically, premium gas) otherwise the engine will ping. I have just bought this car a few days ago. The owner manual states an Octane of 87 or higher. Does anyone have any idea if this is true? Any Ottawa owners? BTW, does anyone notice the "egg smell" from the exhaust? Has there been a recall for that? Thanks!

01-15-2003, 11:50 AM
in my 93 g20 it did ping once high milage kicked in.
same engine. so yes use higher octane.
also, the lower octane tended to kill my gas filter faster and make the car idle harder.

treat your car.

01-20-2003, 12:08 AM
I have tried gas with octane 89 rating and it is doing fine so far. Correct me....is it true that if you have Octane 87 and doing high revs, the engine will ping? Then for daily city commute, Octane 87 should do fine.

03-01-2003, 03:32 AM
I use regular 87 in my 95 G20t with no problems.
91 seems to burn better but 87 is fine

03-26-2003, 08:48 PM
I had used 87 octane gas in my 91 G20 it's whole life and I did drive it fairly hard. It never pinged unless I accidentally bogged the engine by starting in the wrong gear. I never once used anything higher. I just got rid of it in Feb and it had 88K miles on it.
Hope that helps.

03-26-2003, 09:18 PM
88k is nothing,

my car showed problems with idling at 120k with the use of 89

03-27-2003, 12:03 PM
Rotten egg smell is from Sulfur in fuel! The brand/refinery location feed stock and to save money they are not cleaning the sulfur scrubbers often enough or using to much cheaper feed stock......North/South American oil [other than Texas] is much worse ---- higher sulfur content.......Irag/Iran ---middle east has 2/3 less sulfur ......primarily the age of the oil and how many volcanos were near by a Billion years ago.

03-27-2003, 01:52 PM
My dealer said the same when I bought my 03 Qx4. The manual states 87 or higher but recommends 91.

First few weeks I used Premium. I've recently put a few tanks of 87. I have yet to notice any pinging. I've been keeping tabs on my fuel economy to see if this will be cost justified. I need a few more tanks of 87 before I can make any conclusions.

I don't think 87 should cause any problems. The ECU will adapt car timing accordingly. Its probably designed to adapt to a wide range of octance or at least all commonly available grades. But, you may lose some performace if the ECU is tweaked for 91 octance.

If you would like to avoid pinging problems later on, a gasoline with good additives such as chevron (w/ techron) will probably help more than premium no brand gas.

Lots of info about gas, octance, etc:
Gas FAQ (http://www.faqs.org/faqs/autos/gasoline-faq/)

04-01-2003, 07:36 PM
i use 89 octane for mine. no problems so far... still getting about 26-28 MPG average.

04-06-2003, 02:11 PM
My 95 G20t has no problems whatsoever when running on 87 and it has 126K on it. However, when it's cold out I'll put 93 in it.