Sorry...haven't put it in any of my MG's...but after
opening up a '72 B engine I'm restoring (100K+ miles)
that's been running Mobil 1 ever since it first came out
(this 72 B is a one owner car) I was stunned how clean
it all was. Comp. is still 165psi +/-2 in all cyls and the engine
has never had any previous work done on it.
So it convinced me to try it in one of my own cars.
Previously running Castrol 20/50 = 600cold idle 750 cold running
50-600 hot running 25-30 hot idle
With Mobil 1 10/50 65 cold idle 85 colr running
55 hot running 20-25 hot idle
I've only got about 150 miles on the Mobil 1, and the oil
looks like I just poured it in 190 minutes ago.
----- Original Message -----
From: "Carl French" <email@example.com>
To: "Danny Varnado" <firstname.lastname@example.org>; "MG List" <email@example.com>
Sent: Thursday, July 29, 2004 9:16 PM
Subject: Re: Synthetic oil / pressure
> What viscosity oil did you use for the breakin period?
> I too got less than satisfactory pressure with a trial of synthetic and
went back to dino oil. Curious to hear some thoughts on this. You should be
seeing higher numbers at this point. 30w is the standard break in oil.
> Carl French
> Danny Varnado <firstname.lastname@example.org> wrote:
> I've recently finished rebuilding and installing an MGB 18V engine with OD
> trans, into my '58 MGA. I changed the oil and filter after the first 30
> minutes of run time. I changed it again after about 20 miles of driving.
> the 1st 500 miles of break in driving I was running at about 60 lbs. of
> pressure at speed and about 15 lbs. at idle. At 500 miles, I changed the
> and filter again and used Mobil 1. My oil pressure has dropped to 48 lbs.
> 12 lbs. respectively. I have been told that synthetic oils operates at
> pressures and that this is no problem.
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