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Premium Member
1965 Giulia TI/1998 Spider
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I think many people here are using Castrol 20W50.....so we should stop using it?:confused:
 

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Premium Member
1965 Giulia TI/1998 Spider
Joined
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3,981 Posts
here's Castrol's reply to my question about Zinc in GTX20W50, and whether I should switch:

"Thank you for contacting Castrol,

Castrol is aware of articles in enthusiast magazines and web-sites, as well
as after-market parts manufacturer discussions concerning GF-4 engine oils
and cam-shaft durability issues in older performance vehicles. Some
consumers suspect the lower level of ZDDP in GF-4 oils may be causing these
failures. Castrol is currently investigating this issue.

For those consumers that wish not to use a GF-4 oil in these vehicles,
Castrol does offer the following products that contain Zinc at a level that
is typical of the Zinc level found in oils (API SG) marketed during the
"muscle car" era of time:


The following Castrol products have Zinc levels that are typical of API SG
oil:

1. Castrol Syntec 20W-50 (*NEWLY FORMULATED classic oil formula - see link
to website below for information on our new 20W-50 product)
2. Castrol SYNTEC 5W-40
3. Castrol Grand Prix 4T 10W-40 (product has been replaced by Castrol
Motorcycle 4T 10W-40)
4. Castrol Grand Prix 4T 20W-50 (product has been replaced by Castrol
Motorcycle 4T 20W-50)
5. Castrol GO! ATV 10W-40
6. Castrol GO! ATV 20W-50
7. Castrol TWS Motorsport 10W-60 (full synthetic, available @ BMW
dealerships)
8. BMW Long Life 5W-30 (full synthetic, available @ BMW dealerships)
9. Castrol GO! 10W-40 Motorcycle Oil
10. Castrol GO! 20W-50 Motorcycle Oil

If installing a new performance cam in an older performance vehicle, it is
important to:
* follow the installation recommendations provided by the cam
manufacturer
* use the recommended cam break-in lube
* prime the engine oil circuits
* use the recommended engine oil
. confirm valvetrain geometries prior to starting the engine with the
new cam

*
http://www.castrol.com/castrol/genericarticle.do?categoryId=82915470&contentId=7032644

Castrol Consumer Relations."

So this would mean I have to switch to synthetic, right?
 

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Premium Member
1965 Giulia TI/1998 Spider
Joined
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3,981 Posts
they also are fine for a car that doesn't already leak that you want to leak or for a car that leaks that you want to leak more IMO.
My Duetto leaks a little, the GTV leaks A LOT....I'm just too **** scared to put synthetic in either of them:eek::eek:
 

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Premium Member
1965 Giulia TI/1998 Spider
Joined
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3,981 Posts
I haven't noticed any increase in oil temp, reduction in oil pressure, or increased leaking compared to the 20 50 formulas I had been using. In fact, my Fiat 500 seems to start better in the morning.
I agree that the Shell oil seems a better option for me, but I have to consider that I am in a slightly warmer climate than you are, so I am a little worried about going to a lower viscosity oil....or should I not worry?
 

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Premium Member
1965 Giulia TI/1998 Spider
Joined
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3,981 Posts
nah, just water temp gauges.....oil pressure does drop significantly when the engine is hot, but I think no more on hot days, and it is considered to be normal
 
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