[Biturbos4] Synth Oil in the 2.7t
rich at pdi.com
Mon Mar 22 18:09:02 EST 2004
On Mon, 22 Mar 2004, Igor Kessel wrote:
> I heard from my chemist friends that it was best to use as narrow the
> cold/hot viscosity band as possible. Allegedly the band is increased by
> adding long molecular additives. My friends were uniformal in their
> opinion that the less of that stuff we have in the oil the better off we
> are. FWIW.
I belive all multi-grade dino juice uses such additives to achieve
favorable viscosity at higher temps (the polymers get longer with heat
to help the oil maintain it's viscosity when hot).
But evidently certain synthetics don't need additives to maintain their
viscosities under heat as long as the spread doesn't get too wide.
from Ed Hackett's oil FAQ:
"AMSOIL can formulate their 10W-30 and 15W-40 with no viscosity index
improvers but uses some in the 10W-40 and 5W-30. Mobil 1 uses no viscosity
improvers in their 5W-30, and I assume the new 10W-30."
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