<VV> Re: <> Posi additive

[Jim Burkhard]

FYI -  The reason zinc levels have been reduced in motor 
oils is to keep the emissions components in the exhaust 
system (catalytic converters and oxygen sensors) happier. 
They last a lot longer with lower levels of zinc in the 
engine oil.  I don't know too much about the specific 
chemistry behind transmission and gear oils, but I don't 
think they would be under the same pressure to de-zinc if 
they had zinc in the first place.

Jim Burkhard


Ryan Verthein wrote:

> On the other hand...I also just read somewhere about
> motor oils that the oil of today has less zinc in it,
> which is causing premature wear in flat tappets and
> things of the like....so I wonder if that is the same
> for oils for other parts of the transaxle like trans
> fluid, diff fluid...-in our situation- a Corvair.  I
> don't think it would be any different...still oil
> right?