
10-13-2004, 04:02 PM
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Join Date: Oct 2004
Location: Oakland, CA
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Looks like everyone is running premium gas. Is that the octane requirement or is it coz everybody's trying to baby their Milanos?
What is the octane requirement for a 3.0 actually? I can't find any reference to it on the car and I didn't get the owner's manual with the car.
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04 250
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00 996
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88 RX7
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55 550
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10-13-2004, 04:05 PM
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Join Date: Mar 2003
Location: New York, New York
Posts: 2,413
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91 or above.
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10-13-2004, 04:43 PM
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Join Date: Aug 2004
Location: Reseda CA
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5w 50 castrol, and 91 since thats the only octane available in L.A
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10-13-2004, 04:44 PM
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Join Date: Aug 2004
Location: Reseda CA
Posts: 790
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dose that gas booster from auto zone help boost octane from 91, to 92, or is it a boost of 91.5?
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10-13-2004, 05:38 PM
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Join Date: Mar 2003
Location: New York, New York
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NY has octane 93 readily available!
(we used to have 94, too)

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10-13-2004, 06:59 PM
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Join Date: May 2004
Posts: 2,207
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It does almost nothing, like maybe 91 up to 91.2. The fine print is the key, they say it bumps it up a couple points but thier definition of a point is not what you think.
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10-13-2004, 07:02 PM
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Join Date: Nov 2002
Location: SF Gay Area
Posts: 1,694
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The fine print says:
10 points mean 0.1 octane number (RON+MON/2)
But here is a useful site:
http://www.gtatech.com/news_au_articl.html
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10-13-2004, 10:50 PM
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Join Date: Apr 2004
Location: Gold Coast, Australia
Posts: 804
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I use Mobil 1 Synthetic 15W-50 and usually Caltex or BP premium (98 Octane I think?) Unless I'm poor, then just 94 octane
You americans seem to have some low octane fuel ey?
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Bernard M (AKA Mef - Mezevenf)
1986 75QV 3.0L 24v V6 - Silver
1985 GTV6 2.5L 12v V6 - Red
1999 166 3.0L 24v V6 - Red
[URL=http://www.nightspec.com]NightSpec[/URL]
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10-14-2004, 05:13 AM
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Senior Member
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Join Date: Nov 2002
Location: Timonium, MD & St. Louis, MO
Posts: 4,165
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I use Castrol GTX 20-W50 and whatever 93 or better octane I can find.
It has been working fine for me.
Cheers,
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Cheers,
Alex Csank
Chair, Alfa Century 2010 - The AROC USA ALFA Centennial Convention
E-mail: alfaromeodriveralex@gmail.com or alfacentury2010@gmail.com
Mobile: (757) 636-9513
82 Spider Veloce (Desideria - Kathleen's)
84 GTV6 Maratona (Mona - resto project)
88 Milano Verde (Trogdor The Burninator)
"My name is Alex and I am an Alfaholic."
Alfisti are always welcome in our home!
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03-06-2005, 01:20 PM
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Join Date: Mar 2005
Location: Milpitas CA
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I run 20w50 most of the time I have also used the 0-40W Mobil 1 Synthetic
and it seem to work the best. I think I have the sticking bypass in my oil pump
I seem to run very high when cold and it drops to almost 0 at low rpm and only 25psi at 3000 when I tryed 0-40 it seem have the most psi after warmup I think it might have unstuck the bypass. I have 20-50 normal oil in there now I might try the 0-40 again. to see it it helps. As for gas I have been using the 92 but as late I have went to the cheapest. 87 to see if it would knock (thinking of the supercharger) and I have not had it knock yet.
so my guess is I have been wasting mony and runing with less power.
lower octane will give more power for a giving setting. But if knocks it is too low.
But with the low CR of the v6 it looks like it likes the low octane. or the 20° max advance is good for the cheap stuff. IStill testing.. if runing the 92 I guess the timming could be pushed a lot more?
btw I have the 3.0
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03-06-2005, 01:54 PM
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Join Date: Dec 2002
Location: Colorado
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Slyalfa,
Many people have been very happy with the 15W-50 Mobil 1 in the V6s. I'd give that a try if you are concerned about your hot oil pressure, which does seem a bit low to me.
The 3.0 has a slightly higher compression ratio than the 2.5 and was spec'd for Premium by Alfa. It is still a pretty low compression motor by today's standards but doesn't have a knock sensor so the Premium can be a useful safety cushion against knocking. I have found that running an additional 5-7 degrees advance over stock gives the best throttle response and doesn't ping on 91 octane @ 5,500 feet. 92-93 octane should be fine with that advance at sea level.
Joe
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03-10-2005, 04:32 AM
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Join Date: Feb 2005
Location: Madrid (Spain)
Posts: 29
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I used Selenia 10W40 in the V6, but seems light. Probably better would be 10W50.
I started using 97 octane, but lately I was using 95 and it was ok.
Saluti
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Javier H
´89 75 Turbo
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03-10-2005, 12:48 PM
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Join Date: Oct 2003
Location: San Francisco Bay Area
Posts: 62
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I used to get cases of Agip SINT2000 when I worked at a Ferrari dealership, then blew huge wads buying Kendall synthetic 20-50 for my 3 V6 Alfas. There also used to be a nice fuel system conditioner made by Lubro-Moly but I can't seem to find it anymore. Now I just use Castrol 20-50 for the Verde and pretty much all my vehicles (including 2 Land Rover V8s). I use Unocal76 91 octane (no MTBE) but have been spotted at Costco every now and then.
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Chris Robyn
SF Bay Area
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03-10-2005, 09:56 PM
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Join Date: Aug 2003
Location: Yuba City CA
Posts: 464
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Kendall 20w50, and chevron or union 76
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77 Alfetta Sedan
87 Milano Verde
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03-12-2005, 08:08 AM
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Join Date: Jan 2005
Location: Athens, Greece
Posts: 413
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Not that it helps anyone, but in the 3liter I'm using 99-100 RON, available everywhere here (Shell, BP, EKO and others) and Selenia Racing 10/60 oil. I used Valvoline Racing 20/50 for a long time and everything was perfect then too (very clean engine innards, no oil consumption) but at some point they stopped importing it and I switched to Selenia. My CR is 11:1 and I use the std Motronic ECU and std Motronic cams (known as the 'Potenziato' version) No pinging anywhere, even in the track in the summer. 
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