Certainly in the UK oils are usually labelled "for high mileage or older
engines" in the case of 15W/50 or 20W/50 and "for modern engines" in the
case of very light viscosities like 5W/30. There is nothing wrong with
multi-grades per se, it is the grade that is important. I would never use a
modern very light viscosity oil in my MGB, even if it had just been rebuilt
to original tolerances. When GTX in the UK changed from 15W/50 to 15W/40 I
noticed lower hot oil pressures in the V8 and have since changed to another
brand that is still 15W/50.
PaulH.
----- Original Message -----
From: <Aeseeyou@aol.com>
To: <mgs@autox.team.net>
Sent: Saturday, July 31, 2004 5:47 PM
Subject: Re: Multi grade Oil in high mileage engines/cars
> Am I confused (?) misinformed or "spot on" thinking that if you use a
> multi-grade or viscosity motor oil such as a 5-30 w or a 10-40w in a car
with high
> mileage or one that is beginning to "burn oil" or emit "excessive smoke,"
the
> lower viscosity oils are burned off quicker or will become Smokey blow-by
before
> the higher weight oil that came out of the can?
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