Ferrari Mailing List: Re: All about oil????

[Peter Pless (ferrarilist]

Wait...that being the case, then maybe at a high temp, a 5w40 synthetic will
be just as thick as a 10W50 mineral grade ferrari was recommending in
1977!!!....with the advantage of it being thinner when the engine's cold
(which is a good thing)

What do you think?

I know carl jones ran 5W40 in his glass GTB and even though it's broken due
to some very bad fuel, the bores and bearings looked like new after (I
think) 70,000km!

Maybe that's the answer?? When the oil gets really hot (and ferrari has to
protect its engine) the mineral 50 weight got much thinner than the 40
weight synthetic??

Does any of this make sense, or should I get more sleep?

 

-----Original Message-----
From: Hans E. Hansen [mailto:FList [at] hanshansen.org] 
Sent: Wednesday, 26 March 2008 11:17 AM
To: Peter Pless
Cc: The FerrariList
Subject: Re: [Ferrari] All about oil????

On 3/25/08, Peter Pless <ferrarilist [at] pless.com.au> wrote:
> Ok...well that just scared the crap out of me!
>
> I'd still like to know what they'd specify for a 308 if it were made 
> TODAY considering the advances in oil technology.
>

Sure, oil technology has come a long, long way.  But viscosity is viscosity,
old or new.  What has changed on the viscosity front is now there is much
less change (particularly with synthetic...) from cold to hot.  But the
measurement system essentially takes care of that.  The viscosities at the
two temps where the two numbers (10W50, for example) are measured is same
now as 50 years ago.
But at temps either much below or much above those measurement points, newer
oil is a lot better.  Plus, older oils would burn up at temps where
synthetics are just hitting their stride.......

One huge advantage to synthetics (and to some extent the 'hybrid'
blends) is that "viscosity improvers" were necessary in dino oil to achieve
a multi weight rating.  Synthetics just naturally have the characteristics
of a multi weight.  For example, a 10W synthetic has the same viscosity as
10W dino at room temperature, but when hot the synthetic doesn't thin as
much.  So the 10W synthetic naturally behaves like a 50W (or whatever -
example made up!) dino oil at elevated temps because the hot 50W dino has
thinned excessively.

Hans.
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