Yes you can run the thinner oils and yes, there is a limit to the oil
pressure (and volume). The limit is dependent on the actual tolerances, not
the parts.
- Bernd
-----Original Message-----
From: Terrible Tom [mailto:silvereightynine@aol.com]
Sent: Friday, November 02, 2007 6:19 PM
To: dakota-truck-moderator@bent.twistedbits.net
Subject: DML: Oil viscosity and high volume oil pumps
Here's one for The List... if you are running a higher volume/pressure
oil pump - can you then run a thinner oil? Say 5w30 or straight 30
weight - if your engine originally called for 10w30?
I put a high volume melling oil pump in the 318 in Christine, and
noticed higher oil pressures - which is pretty much what I was shooting
for, because the stock oil pump pressure at idle and hot engine
conditions, always made me nervous. There were times when I would see
the oil pressure just at the low end of the normal range.
Any adverse affects of having too much oil pressure - besides the
obvious spinning of engine load bearings?
However using a thinner oil will help - in theory, the fuel economy, due
to less internal parasitic energy loss.
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