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05-08-2008, 12:32 PM
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I get my Mobil 1 at walmart, too. Just out of curiosity, what are the differences between the "plain" and "extended" 15w/50?
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05-08-2008, 12:41 PM
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Gennie Cream Ale please
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Join Date: Sep 2005
Location: Franklin & #414
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I think the extended has more detergents for one thing
"Mobil 1 Extended Performance oils are uniquely designed to provide outstanding levels of performance, cleaning power and engine protection, even during longer oil change intervals."
Mobil 1 Extended Performance
But I doubt us Alfa owners would leave it in for such an extended period plus I'd be afraid with all the detergents it might loosen stuff up and/or clean up too much around the gaskets.
The regular may have more zinc:
"Mobil 1 15W-50 is also recommended for older valve train designs that may benefit from a higher level of anti-wear normally not required for newer generation vehicles"
Mobil 1 15W-50
Higher Visocity Index and Flash point also in the regular.
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Last edited by lowmileage; 05-08-2008 at 12:45 PM.
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05-08-2008, 05:31 PM
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with the Librarian
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Join Date: Feb 2003
Location: New Jersey USA
Posts: 7,244
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I guess Alfa may have been at the race track or something that day and missed the class on maximum viscosity spread. The Alfa recommended oil from 1990 and up is 10w-40. 1974-1989 was 10w-50.
Guess someone ought to tell Alfa they've got it all wrong, eh? 
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Jim
Series 1 Euro 1750 GTV
Series 2 US 1750 GTV
Series 3 Spider Veloce
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05-08-2008, 05:40 PM
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Weaving a Spider's web
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Location: BC
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I use 10w-40 cause that's what it says under the hood.
How would this be bad?
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S4 x 2
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05-08-2008, 05:46 PM
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Slacker
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Location: Northern NY, USA
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 Quote:
Originally Posted by brownie93
I use 10w-40 cause that's what it says under the hood.
How would this be bad?
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Quote:
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Originally Posted by papajam
The Alfa recommended oil from 1990 and up is 10w-40
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Ummmm, say what now?
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05-08-2008, 08:01 PM
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Registered User
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Yep, my 91 service manual states 10w40, but I too have always used Mobil 1 15w50. Not sure thats the best thing to be using or not but I do know that the current thinking is 10w40 is crap. Some new car warrenties will be voided if you use 10w40.
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05-08-2008, 09:14 PM
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I'm glad we've been able to establish the most suitable oil for our cars.
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05-09-2008, 06:12 AM
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Gennie Cream Ale please
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Join Date: Sep 2005
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Quote:
Originally Posted by papajam
I guess Alfa may have been at the race track or something that day and missed the class on maximum viscosity spread. The Alfa recommended oil from 1990 and up is 10w-40. 1974-1989 was 10w-50.
Guess someone ought to tell Alfa they've got it all wrong, eh? |
Just reporting what has been said currently about 10w-40. Everyone can of course make their own decision bout what they want to use.
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05-10-2008, 09:45 PM
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I vote for Castrol GTX 20w-50
-Raffi
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-1974 Alfa Romeo Spider (still working on it)
-1980 Volkswagen Scirocco (Bone stock & original, 51K miles...)
-1987 Volkswagen Scirocco 16V (2.0L, Nothing stock or original)
-2003 Volkswagen Jetta TDI (Saves me money for the above)
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05-10-2008, 10:47 PM
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Registered User
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Regards 10-40 and 10-50 as recomended by Alfa, aren't they specifying Agip Sint (sint=synthetic)? I'm too lazy to go out in the garage and check, but that's what I seem to recall.
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05-12-2008, 06:14 AM
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I don't think brand names have that much to do about it. Thier all about the same when you read the label, they all conform to the same standards. My dad used to say you should stick to one brand, in other words if you start using Valvoline, you shouldn't add Pnsoil later because sometimes different sources of crud don't mix well. My hot-rod mechanic says if the owners manual says 10W40, to use 10W30. May using the 15W50 on the my S4 is not what I should be using. I'm using 10W30 on my 400hp Ford hot rod and a can or BG-MOA
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05-12-2008, 06:30 AM
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FORZA ASSERGI
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Join Date: Sep 2005
Posts: 820
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Quote:
Originally Posted by DarkWolf40
My dad used to say you should stick to one brand, in other words if you start using Valvoline, you shouldn't add Pnsoil later because sometimes different sources of crud don't mix well. My hot-rod mechanic says if the owners manual says 10W40, to use 10W30.
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Ciao tutti
Newly retired so, Non mi rompere i coglione.
93 spider (red)
87 milano (not red)
Last edited by aldo; 05-12-2008 at 06:38 AM.
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05-12-2008, 01:39 PM
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'Tis a hot rod thing:
Thinner viscosity oil is easier to shove through the engine by the pump, therefore less parasitic drag rsulting in a wee bit more power at the crank.
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05-12-2008, 01:52 PM
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Gennie Cream Ale please
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Last edited by lowmileage; 05-12-2008 at 01:55 PM.
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05-12-2008, 02:10 PM
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Picking for no other reason than my own amusement at a couple spots in the above linked article:
Quote:
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A thinner oil can more easily and quickly be 'pumped-up' to the critical parts of the engine, takes less energy to move it around, helps the engine to produce more power
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Quote:
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Unless your car is an actual bonafide 'RACE CAR'- no city driving, no idling, no stop and go traffic, no foul weather driving, etc...- Do NOT use 'racing' oil in your engine. Racing oil has a very narrow and specific additive package designs for engines that are used in racing situations, like constant high rpm operation, steady speeds, no stop and go, no foul weather, etc...
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Spoken like a man who has truly never been in or seen an endurance road course race. (strange what some people define as racing that others do not even acknowledge exists. It ain't all about running around in circles)
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As an example: start with 10W-30, and at 500 miles top it off. If 1,000 miles later you are a quart or half a quart low, record it and continue with the test. At 3,000 miles, if you have had to add more than a quart counting from the first 500 mile top-off, then you should use 10W-40 on the succeeding oil change.
Record your results again. If the 10W-40 does not volatize as readily then you should stick with that. However, if it still burns away, then try 20W-50.
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Must not be talking about an Alfa engine 
As I said, for my own amusement, becuase I am indeed easily amused. Nothing more, nothing less.
Last edited by Tifosi; 05-12-2008 at 02:15 PM.
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'84 manufacture - '85 MY Spider Graduate 
