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  #16 (permalink)  
Old 10-13-2004, 04:02 PM
secobarbital secobarbital is offline
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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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  #17 (permalink)  
Old 10-13-2004, 04:05 PM
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91 or above.
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  #18 (permalink)  
Old 10-13-2004, 04:43 PM
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5w 50 castrol, and 91 since thats the only octane available in L.A
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  #19 (permalink)  
Old 10-13-2004, 04:44 PM
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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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  #20 (permalink)  
Old 10-13-2004, 05:38 PM
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NY has octane 93 readily available!

(we used to have 94, too)

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  #21 (permalink)  
Old 10-13-2004, 06:59 PM
Greg Gordon Greg Gordon is offline
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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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  #22 (permalink)  
Old 10-13-2004, 07:02 PM
75evo 75evo is offline
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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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  #23 (permalink)  
Old 10-13-2004, 10:50 PM
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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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  #24 (permalink)  
Old 10-14-2004, 05:13 AM
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Alex Csank Alex Csank is offline
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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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  #25 (permalink)  
Old 03-06-2005, 01:20 PM
slyalfa slyalfa is offline
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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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  #26 (permalink)  
Old 03-06-2005, 01:54 PM
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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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  #27 (permalink)  
Old 03-10-2005, 04:32 AM
vinchi vinchi is offline
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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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  #28 (permalink)  
Old 03-10-2005, 12:48 PM
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josiechris josiechris is offline
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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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  #29 (permalink)  
Old 03-10-2005, 09:56 PM
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Kendall 20w50, and chevron or union 76
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  #30 (permalink)  
Old 03-12-2005, 08:08 AM
Jim K. Jim K. is offline
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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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