My guess is that they foam because of the constant turning of the gears in
the oil bath. That would or could lead to pressure build up and leakage past
the seals (more than the calculated and engineered leakage).
In an engine foaming (if any) would be while coating the cylinder walls or
lubricating the moving parts but not while sitting in the pan waiting to be
pumped back through the system.
JVV
----- Original Message -----
From: "Don Malling" <dmallin@attglobal.net>
To: "Triumph Mailing List" <triumphs@autox.team.net>
Sent: Friday, February 20, 2004 10:35 AM
Subject: Re: Fluid for Overdrive Transmission
> John Esposito at quantumechanics.com says that detergent oils should not
> be used in an OD because they foam.
>
> Is there a reason why a modern detergent oil would foam in a gear box
> but not in an engine? Or do they in fact foam in an engine as well, but
> it matters in a gear box but not the engine?
>
> Don Malling
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