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NG900 & OG9-3 Workshop NG900 (1994 to 1998) & OG9-3 (1999-2002) & '03 Convertible Technical Forum

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  #1  
Old 4th June 2010
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Default what kind of gas to us??

so i picked up my saab today and it was on R "meanin E"...and one person tells me to put in 87 octane gas...and then another saids 93 octane.
Whitch gas do i use 87 or 93??
Is there any adventages with the 93?
is there any bad things with using 89??

btw i hav a 1996 ng900 se turbo
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  #2  
Old 5th June 2010
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87 should be fine, but I'm sure with 93 you will get more power and possibly better milage.
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  #3  
Old 5th June 2010
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93?! I use 91 ever time I fill up. Where do you get 93? When you pay for a higher premium gas it does not improve your power (HP wise). The only thing you are improving is the reduction in autoignition before TDC (not talking about diesel either). You get a more controlled burn through-out each cylinder. Also a premium gas is often used in high performance vehicles due to the high compression (an increase in pressure is proportional to an increase in heat). I don't think our cars have a drastic compression ratio. Just basic Thermodynamics. Pinging can eventually damage your engine though.

Long story short you are safe to burn 87. I use 91 from Shell. Their nitrogen enriched fuel. Hopefully it is doing its job and helping my injectors stay a little cleaner.
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  #4  
Old 5th June 2010
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I've been running 87 octane for a while. On a 120 mile highway drive yesterday, I had a high of 36.0 mpg on SID. This was on country roads at 55 mph with an occassional stop sign/traffic light/railroad crossing... Ron
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  #5  
Old 5th June 2010
Tweek's Turbos Tweek's Turbos is offline
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I have always run and always will run the highest octane. Since the early 80s, starting the APC saab will retard the timing if it feels the octane is too low for the demand of the right foot.
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  #6  
Old 5th June 2010
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thanx sry about 93..yes i ment 91...and it seems to b a lot of people sayin use 91 and also shell...well looks like ill b usin shell 91
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  #7  
Old 5th June 2010
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We have 93 here in IL at almost every station.
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  #8  
Old 5th June 2010
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Blimey, i never knew fuel was that different in the US. Fuel over here in the UK is 95 minimum and posh stuff starts at 97 some 99 and the super expensive BP 102. (everyone over here recommends running these cars on 97, and my manual suggests the minimum for the car is 91, maybe the US cars are different)
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  #9  
Old 5th June 2010
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It's not a difference in the cars, but a difference in how the octane rating is advertised... RON in the UK, (RON+MON)/2 in the US.
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  #10  
Old 5th June 2010
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Quote:
Originally Posted by Kei View Post
Blimey, i never knew fuel was that different in the US. Fuel over here in the UK is 95 minimum and posh stuff starts at 97 some 99 and the super expensive BP 102. (everyone over here recommends running these cars on 97, and my manual suggests the minimum for the car is 91, maybe the US cars are different)

man i wish we had 102 in the states...then again probly a lot of money
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  #11  
Old 5th June 2010
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Quote:
Originally Posted by Oscuro View Post
It's not a difference in the cars, but a difference in how the octane rating is advertised... RON in the UK, (RON+MON)/2 in the US.
I knew it would be something simple that i had missed. As for the 102 BP stuff, it is $3.50 per litre and $238 to fill the tank. (converted from the UK price of 2.42 per litre)
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  #12  
Old 5th June 2010
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Go with the 91 oct from Shell... usually works out to about $5 more per tank than 87 oct so unless you're on a really tight budget you should go with the higher octane.
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  #13  
Old 5th June 2010
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102 in the uk is not the same as what 102 would be in the states.
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  #14  
Old 5th June 2010
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I was a bit surprised to see that Saab did not recommend (require?) premium fuel in the 2.3 liter engine. After I picked up my 97 900S, I put Shell fuel system cleaner in the tank and filled up with Shell premium (91 octane in Colorado). After driving it about 150 miles, I can tell it is running more smoothly than when I test drove it (prior to fuel system cleaner and a tank or premium fuel). With a turbo, I would use premium--whether that is 91 or 93 octane in the US will depend on where you live.

Generally, I try to use the highest octane available in a Saab/BMW/Audi/etc., not because I think I'm getting more performance or better mileage, but because it is a more even burn and is less likely to cause pinging/knocking. When I've had Hondas in the past, I couldn't tell a difference between 85 and 91 octane.
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  #15  
Old 5th June 2010
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Shell is a Top Tier Fuel, which is why I use it
http://www.toptiergas.com/

(even though I don't use Rotella oil, I use Redline 5w40...)
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  #16  
Old 6th June 2010
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here in US I have been using shell vpower for past 5 years in my 1999 93 conv with t5 185hp engine and 110k...i never had any problems with fuel system and car performs brilliantly...i have shell credit card that gives me 1% discount on their fuel...i seriously would have to be in the middle of nowhere to put something else than vpower in my baby ..i stick with one or two shell gas stations in my area that seems to be clean and well kept...

Last edited by cascade; 6th June 2010 at 09:03 PM.
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  #17  
Old 7th June 2010
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I used shell for a long while, but then got lazy and went with BP due to the location. Due to BP f-ing up big time in the gulf, I have switched back to shell (for my viggen) which makes the car run much better.
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  #18  
Old 7th June 2010
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Quote:
Originally Posted by saab&engineer View Post
93?! I use 91 ever time I fill up. Where do you get 93? When you pay for a higher premium gas it does not improve your power (HP wise). The only thing you are improving is the reduction in autoignition before TDC (not talking about diesel either). You get a more controlled burn through-out each cylinder. Also a premium gas is often used in high performance vehicles due to the high compression (an increase in pressure is proportional to an increase in heat). I don't think our cars have a drastic compression ratio. Just basic Thermodynamics. Pinging can eventually damage your engine though.

Long story short you are safe to burn 87. I use 91 from Shell. Their nitrogen enriched fuel. Hopefully it is doing its job and helping my injectors stay a little cleaner.
If I wasnt too lazy to search for it, Id repost something I wrote last time this came up. In the long term, using 93 octane is cheaper because of increased fuel economy.

And in all actuality, it actually does improve power. More truthfully, running lower octane takes away power. Regardless, the result is the same.

For those who dont know, nitrogen enriched fuel is a scam. You pay a premium for something that at best does next to nothing. In the case of my cars, it also hurts performance. I always avoided Shell with the convertible and the Viggen gets it only rarely. The cars always run their worst and were/are down on power with Shell in the tank.
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  #19  
Old 7th June 2010
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It's so weird to hear different users having different experiences with different gas companies. Most gas comes from huge pumping stations where tanker trucks roll in with different stickers on the side of the truck with different gas station names. The only ones that do not fill at these pump stations are chevron, shell and few other as there gas is some-what specially formulated with their own additives, with chevron probably being the best as their additive techron is known to work. Nitrogen in gas-whatever to that, but for my car it's better than BP for some reason, but was worse than chevron.
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  #20  
Old 7th June 2010
boostfreak boostfreak is offline
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you could always drive to ohio, we have 110 race fuel from shell at $7 a gallon, used to put it in my supra, nothing lile $130 tank of gas that would last an afternoon lol. I use 89 unless I know I am going to be running hard then Ill put in 93, but I swear by shell, when i can find them it is all I use, mobile one is my second choice plus they have 93 aswell.
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