No subject

anymore, just a Physics Teacher), it won't hurt a tight bearing clearance
engine with thicker oil (unless the oil is soooo incredibly thick that it
doesn't flow at all to the journal bearings, I don't think the type of motor
oils we're talking about are in that catagory), it'll just cause
signifcantly more viscous drag. However, the opposite is not true. If there
is loose clearance engine designed for heavier weight oils, low viscosity
oils may not be able to create a thick enough film at the bearing to support
the loads (unless you can increase the oil flow rate significantly enough
that oil flow creates a supporting film) and bearing scoring may result.

LL - NY

On 2/25/08, Rick Cone <uglydog56 at yahoo.com> wrote:
>
> I wouldn't worry if your engine isn't sludging.  reference 50 year old
> unrestored engine with crap oil.  Engine clearances are set with a certain
> oil in mind.  A tight-built engine designed for light oil will suffer damage
> when run on 20-50.  On the other hand, I had a 327 built by a guy that swore
> by 20-50.  I tried to run it on lighter oil, and it used like crazy.  Put
> 20-50 back in it, and the oil usage instantly disappeared.
>
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