clare at snyder dot ontario dot canada wrote:
On Sun, 12 Oct 2008 16:06:24 +0200, "Steve Lusardi"
wrote:

Karl the clearances are much tighter on today's engine. Oil pressure is the
indicator of "potential" flow, but it's all about flow. If the viscosity is
too high, flow will be reduced, because when there is enough pressure to
lift the ball from the seat in the regulator, that will represent an easier
path and pump flow will be directed through the regulator and not the rest
of the engine. Use the viscosity the factory recommended. They built the
engine, not your son.
Steve


Go check the bearing clearance specs on the new engine and compare to
an older engine of the same manufacture what spec'd the heavier oil.
Will you find a difference in oil clearances?
Betcha won't.

If you do publish them here.

Uh, you would be wrong.

Here are the numbers for the early 3.8 through the latest 3800 engine.

3.8 prior to 89 - .0012 -.0025

3.8 89-96 - .0010 - .0025

3800 96-98 - .0010 - .002

3800 from 98-08 - .0008 - .0018

Those are from GM themselves. Similar changes have occurred on the rest
of the lines.

--
Steve W.


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