Gas brand and octane discussion (91 vs 93 or above)
07-16-09, 12:10 PM
#32
Nope. If it did that then it would recommend 93 in the owners manual.
The car has -no idea- what kind of fuel you put in it, so all it can do it run the normal max timing it's programmed for, which should correspond with no knocking at 91 octane for the 2IS, hence the 91 octane requirement.
07-16-09, 04:49 PM
#35
Now take the engines apart.
I'd be very surprised if you could find any measurable or significant
difference.
(the above assumes none of the station owners, who are generally independent and just pay for the name on the station, waters down his gas or does anything else shady, which'd be just as likely with one brand as another)
07-16-09, 04:51 PM
#36
just fill whatever you think you "feel" better after putting in ur car and stick to that ... aslong u stick to known brands of gas . ur car will be fine .. i never heard or someone filling their car with fuel and have their car ****ed up
07-16-09, 05:15 PM
#37
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As long as you go with big name brands I agree, chances are your car won't necessarily **** up.
I've just seen so many positive reviews about the additives that Chevron puts in versus Shell's additives that for me (given how convenient it is for me to fill up on either Chevron or Shell, it's my choice) going with Chevron just makes sense.
Of course I'm not going to go out of my way just for Chevron if I'm running low, but if it's convenient and I have the choice, why not
I've just seen so many positive reviews about the additives that Chevron puts in versus Shell's additives that for me (given how convenient it is for me to fill up on either Chevron or Shell, it's my choice) going with Chevron just makes sense.
Of course I'm not going to go out of my way just for Chevron if I'm running low, but if it's convenient and I have the choice, why not
07-17-09, 05:41 AM
#38
Shell's cleaning additive is nitrogen enriched. It is a key element of the active cleaning molecule in Shell’s new fuel (March of this year), supposedly making it significantly more stable at higher temperatures which is common in modern direct fuel-injection gasoline engines. The increased stability ensures that the molecule can work under much tougher engine conditions by resisting thermal breakdown better than conventional cleaning additives. This new formula is supposed to have five times the cleaning power of fuel with the EPA’s minimum requirements. Is it better then Chevron's, time will tell!
Koz
Koz
07-17-09, 10:13 AM
#39
The other factual reason I use Chevron premium in my cars: I bought a 1986 Prelude SI new used Chevron (regular for this car low compression) used Shell a couple times noticed Idle speed began to fluctuate. 2 tanks of Chevron cured idle problem, wife refueled with Shell idle problem returned, Chevron fixed problem again. I assume Shell has fixed that problem in the last 20 years but I believe Chevron is as good or better than any other fuel other than maybe Amaco. I am confident that there are many brands & individual stations where quality control is not up to Chevron standards. I have discussed this with a chemical engineer who designed & setup several refinerys here in So.CA & around the country (all brands ) he only buys gas with his Chevron card. I lived in Manhattan Beach for 10 yrs. across the street from the Chevron refinery which has been there since 1914 & went on the annual tour of the refinery. Chevron costs 3 - 4 cents more a gal. but why gamble with the unknown ??
07-18-09, 10:22 AM
#42
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