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Post by KliffsAurora on Apr 25, 2008 17:14:14 GMT -6
92 or 93 Premium.
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Post by tiberiusjones on Apr 25, 2008 17:50:29 GMT -6
89 works great (and is recommended) for the 3.5 Mine runs like a clock - a really fast clock!
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bld
Aurora Groupie
Posts: 128
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Post by bld on Apr 29, 2008 13:20:12 GMT -6
In my '99, the mpg went up enough to more than pay for the super.
Prior owners had run regular. I ran regular at first. Then I switch to super. MPG went up significantly. Hard to say on performance, but obviously it has to help some (basic engineering). Looking at the new mpg numbers, I found I came out ahead even with the extra cost of super. Been feeding her super ever since.
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Post by shrek on Apr 29, 2008 19:34:41 GMT -6
If gas keeps going up i won't be using either.I will have to start hicthhiking
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Post by white2002aurora on Apr 29, 2008 19:47:47 GMT -6
I could ride my bike to work....oh wait Ima be laid off May 8th and probably won't get called back till next year.................. Anyone wanna hire me under the table lol :-)
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Post by aurora2001tan on Apr 29, 2008 23:05:09 GMT -6
If you go to Marathons website they say 89 and 93 gives better performance and gas mileage on cars with knock sensors.
I know its coming from the devils themselves but just thought id throw that in.
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Post by white2002aurora on Apr 30, 2008 5:06:13 GMT -6
I run 87 usually and occasionally the 93.
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Post by slowerlower on May 4, 2008 7:21:49 GMT -6
99 aurora i us prem gas only. like that old oil filter ad pay me now or pay me later. if you can;t afford it buy a smaller car and leave these beautys to us
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Post by slowerlower on May 4, 2008 7:27:15 GMT -6
bld was 100% right you make up the differences in milage useing premium
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Post by Marc on May 4, 2008 8:03:47 GMT -6
With a 10.3:1 compression ratio, the PCM would have to set the spark timing very far back when running on regular, and that would kill gas mileage dead!
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bld
Aurora Groupie
Posts: 128
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Post by bld on May 5, 2008 8:36:13 GMT -6
Marc is correct, there is some basic science behind this. Performance and mileage have to be better, to some degree, with higher octane gas.
In my case, the mileage is improved more than enough to make the additional super price a good investment.
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Post by Aurora40 on May 6, 2008 8:21:24 GMT -6
With a 10.3:1 compression ratio, the PCM would have to set the spark timing very far back when running on regular, and that would kill gas mileage dead! If you are cruising, the cylinders are not filling much at all. You will see zero retard on pretty much any street car that is run at light throttle. I would be very surprised to see premium vs regular make any difference in cruising economy.
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Post by SPL15 on May 9, 2008 18:51:16 GMT -6
I run 93 octane, I floor it a lot. When I floor it, I can hear a tiny tiny bit of spark knock. Not enough to be worried about, just the right amount for max power. From what I understand, a little spark knock at WOT is a good thing. Looking in my cylinders with a rifle borescope, I have almost no carbon deposits in my front cylinders. Seafoamed it and that stuff works great. When I did my starter, my intake valves were perfectly clean and you could clearly see the machining marks on the top of the pistons. I ran 89 for a while, didnt really notice the difference between that and premium, but for my own head, it's better Keeping knock down on a N* engine with 175K miles on it is a good thing, Especially if you can hear light spark knock at WOT. That's mainly why I use permium still.
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Post by shiftgrind on Jun 27, 2008 22:37:20 GMT -6
i would use 89 octane for a few reasons
1- you can usually get it for the same price as 87 octane.
2 - your gas mileage will go up. my work van picked up 2mpg avg switching from 87 octane to 89 with no computer changes. i further added timing to it and picked up another 2 mpg. this was true with my buick, and many other car club members. we have to run 92-93 octane, but when we run 100 octane race gas, with no pcm changes, mileage goes up 6-8 mpg.
3. if your getting knock, your pcm cant compensate for it until it knocks, so the "damage" is already done. if you continue to get alot of detonation, your pcm reverts to its low octane timing tables, and you'll get noticeably worse mileage and power.
you pay about 0-3% more for mid grade and it yields 8%+ better gas mileage.
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Post by rvrrat on Jun 30, 2008 15:16:58 GMT -6
your lucky Regular in MA is closer to $4.00 a gallon
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Post by lanceslambos on Jun 30, 2008 16:34:44 GMT -6
the previous owner of my 97 with 113XXX ran the cheap stuff only. he only used the car for long road/buisness trips with the cruise set. he swore there was no difference in fuel mileage between regular and primo but my experience with it has been that the cheap gas sets off the 02 sensors/check engine lite every time plus my mileage goes down and i get slight engine knock. i fill er up with primo and the engine light goes off and mileage goes right back up with no retard spark knock. so to me the extra 30 cents a gallon is worth the extra 5-7 mpg average plus piece of mind with my engine. i know the 4.0 runs pretty clean already according to internal engine inspections posted around the net but it can only last longer with better gas, change plugs less often etc.
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alby
Aurora Newbie
No one has the Right to Harm you in any way! Me.
Posts: 10
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Post by alby on Jul 18, 2008 10:05:48 GMT -6
thanx so can i use super?
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Post by aaaauroraaaa on Jul 18, 2008 10:08:27 GMT -6
thanx so can i use super? yes.
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alby
Aurora Newbie
No one has the Right to Harm you in any way! Me.
Posts: 10
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Post by alby on Jul 21, 2008 20:02:44 GMT -6
thanx very much!
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alby
Aurora Newbie
No one has the Right to Harm you in any way! Me.
Posts: 10
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Post by alby on Jul 22, 2008 19:29:13 GMT -6
i just switched to Super, i hope don´t get any future problems!
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Post by tlt on Aug 22, 2008 14:20:46 GMT -6
When I got my '97 Aurora regular gas was $1.20 and premium was $1.40. That was a big enough difference that I decided to see if regular really would work in the Aurora. The exact figures are long gone but the difference in mpg alone (about 3 mpg) made the cost per mile about the same with either fuel. The loss in power with the regular was enough that I have been running premium gas in the Aurora ever since.
With today's gas prices it would cost me more to use regular than premium.
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marinedoc
Aurora Groupie
HM2 Breeden, Matthew (NAC) USN
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Post by marinedoc on Aug 28, 2008 21:39:18 GMT -6
owners manual for my '01 4.0 says to use 91 octane or higher. $3.40 difference for me if I fill up with premium, that's about $110 difference a year. Not that big a deal for something that's better for my car if you ask me.
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Post by ryan2ndgenaurorav8 on Sept 14, 2008 17:16:06 GMT -6
When I floored it in my 01 aurora v8 it was of course fast. Now after switching from 87 to 92 bp invigorate premium, its so fast that the tcs comes on. It sounds better runs smoother, response is better, and I think its worth it. You can save a gallon a fillup but also i believe premium gets a little better mpg.
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Post by ryan2ndgenaurorav8 on Sept 14, 2008 17:18:41 GMT -6
When I floored it in my 01 aurora v8 it was of course fast. Now after switching from 87 to 92 bp invigorate premium, its so fast that the tcs comes on. It sounds better runs smoother, response is better, and I think its worth it. You can save a gallon a fillup but also i believe premium gets a little better mpg. Now for the 3.5 v6 definately put 87. 95-99 premium or 89 at worst. 01-03 v8 is tricky, it says it only needs 87, but there is a noticeable difference in drivability from 87 to 91-93. That tells me that premium is worth it. If your going to pay 60-72$ a fillup make it worth it.
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Post by Marc on Sept 14, 2008 18:12:20 GMT -6
Now after switching from 87 to 92 bp invigorate premium, its so fast that the tcs comes on. It sounds better runs smoother, response is better, and I think its worth it. Right.....the 2nd gen 4.0 needs premium to develop its full power potential.
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Post by killroypete on Sept 14, 2008 22:07:40 GMT -6
Just went to the Popular Mechanics review (2001), and they do write down "premium required".
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Post by 95oldsaurora on Sept 17, 2008 13:52:11 GMT -6
i no for a fact first gens are suppose to run premium but if u run regular for a period u can hear a knock right before she starts and not too long ago we put shell V-power in and she never had a knock again and u can tell a power and fuel economy difference between regular and premium
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Post by roara on Sept 23, 2008 13:53:38 GMT -6
Premium
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Randy T.
Administrator
☯ AURORA GXP ☯
Posts: 3,758
Staff Member
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Post by Randy T. on Sept 27, 2008 8:31:15 GMT -6
I have been running 94 octane, no problems!
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Post by lanceslambos on Sept 27, 2008 18:16:43 GMT -6
yea i'm so jealous you have 94 down the road from you RT b/c thats how far it is from me. btw how much per gallon or on average if premium is usually 30 cents a gallon more than reg so is 94 another 30 cents ?
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