I have a pretty good idea what's happening here in terms of "viscometric" behavior, but I'd be interested in what other folks have to say.
I should note that this formulation doesn't carry the VW 502.00/505.00 specs, or even ACEA A3/B4, and Amsoil doesn't recommend it for this application. It does show that high quality, PAO/Ester synthetics tend to be pretty versatile....
2002 Audi TT Quattro Roadster, 1.8L/225 Hp
Amsoil 0w-40, "Four Stroke" oil
Miles on engine, 60,000
Miles on oil, 10,000
Oil consumption, 0.75 qts
OEM air/oil filters
Physical/Chemical properties:
water/glycol, none
fuel < 0.5%
oxidation, 28 abs/cm
nitration, 36 abs/cm
*Viscosity @ 100C, 15.8 Cst*
TBN, ASTM D-4739, 4.25
Wear Metals:
Fe, 10 ppm
Cr, 0 ppm
Pb, 0 ppm
Cu, 12 ppm
Sn, 0 ppm
Al, 1 ppm
Ni, 0 ppm
Na, 0 ppm
K, 0 ppm
Silicon, 14 ppm
Oil Additives:
Boron,38 ppm
Mg, 816 ppm
Ca, 2769 ppm
Phos, 1115 ppm
Zn, 1312 ppm
TS
I should note that this formulation doesn't carry the VW 502.00/505.00 specs, or even ACEA A3/B4, and Amsoil doesn't recommend it for this application. It does show that high quality, PAO/Ester synthetics tend to be pretty versatile....
2002 Audi TT Quattro Roadster, 1.8L/225 Hp
Amsoil 0w-40, "Four Stroke" oil
Miles on engine, 60,000
Miles on oil, 10,000
Oil consumption, 0.75 qts
OEM air/oil filters
Physical/Chemical properties:
water/glycol, none
fuel < 0.5%
oxidation, 28 abs/cm
nitration, 36 abs/cm
*Viscosity @ 100C, 15.8 Cst*
TBN, ASTM D-4739, 4.25
Wear Metals:
Fe, 10 ppm
Cr, 0 ppm
Pb, 0 ppm
Cu, 12 ppm
Sn, 0 ppm
Al, 1 ppm
Ni, 0 ppm
Na, 0 ppm
K, 0 ppm
Silicon, 14 ppm
Oil Additives:
Boron,38 ppm
Mg, 816 ppm
Ca, 2769 ppm
Phos, 1115 ppm
Zn, 1312 ppm
TS