[DeTomaso] oil choice

[Pantdino]

I see sump size as being a factor in oil viscosity selection and is related to how you use the car.
The more oil is in the sump the longer it will take to get to operating temperature-- about twice as long for 10 qts as for 4.5 qts.  So if the car has a 10qt sump and the person is starting the engine and just pottering around the neighborhood for 20 minutes he is better off with a thin oil which will have the correct viscosity at the temperature it is actually being used at.

In my cars with oil temp gauges I never see the 100 dec C temp at which hot viscosity is quoted.

But you're right in that if you're driving for 3 hours at high speed every time you drive then sump capacity is irrelvant because it will come to a stabilized temp regardless.  You really have to have an oil temp gauge to know what kind of oil to use.  My Pantera does not so I use "oil pressure at idle" as a guide to when it has reached operating temp, but it is not optimal.

Jim






-----Original Message-----
From: Julian Kift <julian_kift at hotmail.com>
To: pantdino at aol.com; michael at michaelshortt.com
Cc: De Tomaso List <detomaso at realbig.com>
Sent: Sun, Mar 20, 2011 2:44 pm
Subject: Re: [DeTomaso] oil choice



rue in part on rev limit, time at limt etc., but IMO sump size is a different 
uestion and irrelvant on oil selection, if your oil pump runs dry it ain't 
onna matter how much Zn & P you got.

opic drift a little but more damage is probably done on occasional use dry 
tarts where oil has drained from wetted surfaces than anything, IMO an oil 
ccumulator (Accusump) is one of the best investments you can make for a car 
hat sits for periods between use.

ulian


o: michael at michaelshortt.com; julian_kift at hotmail.com
ubject: Re: [DeTomaso] oil choice
ate: Sun, 20 Mar 2011 17:00:58 -0400
rom: pantdino at aol.com
C: detomaso at realbig.com

t is not possible to answer this question without knowing how you use the car.
ow big is your sump?
o you track the car or otherwise run it at high revs for long periods?
hen you drive it, how and how long do you do so?

 used Castrol 20-50 in my cars for years and now feel that I probably caused 
nnecessary engine wear in doing so.

im


-----Original Message-----
rom: michael at michaelshortt.com <michaelsavga at gmail.com>
o: Julian Kift <julian_kift at hotmail.com>
c: De Tomaso List <detomaso at realbig.com>
ent: Sun, Mar 20, 2011 1:52 pm
ubject: Re: [DeTomaso] oil choice

an O'worms question!  I like Castol 20-50w and add the Zddp from Eastwoods,
helby or Garlits.
Michael Shortt
n Mar 20, 2011 2:44 PM, "Julian Kift" <julian_kift at hotmail.com> wrote:

 Many people might ask whether your cam is roller or flat tappet,
ersonally I don't take any chances and use exclusively Brad Penn (Kendall)
il which I know has sufficient zinc and phosphorous.

 Julian

> Date: Sun, 20 Mar 2011 14:23:06 -0400
> From: boyd411 at gmail.com
> To: detomaso at realbig.com
> Subject: [DeTomaso] oil choice
>
> What is the best choice for a commercial oil for a slightly modified
> cleveland engine ( msd igniion, Mild cam,headers holley 650) and should I
> add an additive?
> Boyd
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