Upon looking at the PDS for Castrol synthetics, their oils seem to be worse or equal to conventional motor oils. Very high MRV numbers, and relatively low VI. Compare it to PUP or QSUD, VI is in the 170s and very low MRV ~4000 (cP). Of course you have to realize that -35c is reaching the pour point of most oils, so the average user will never experience these extremes, but overall I'm not impressed.
Castrol EDGE High Mileage 5w-30:
Density @ 15C, Relative ASTM D4052 g/ml 0.856
Appearance Visual - Clear & Bright
Viscosity, Kinematic 100C ASTM D445 mm²/s 11.3
Viscosity, CCS -30C ASTM D5293 mPa.s (cP) 6200
Pour Point ASTM D97 °C -39
Viscosity, MRV / Yield Stress -35C (5W) ASTM D4684 mPa.s (cP) 35000
Viscosity, Kinematic 40C ASTM D445 mm²/s 67.2
Viscosity Index ASTM D2270 None 159
Noack Volatility ASTM D5800 % Loss 10.0
Flash Point, PMCC ASTM D93 °C 220
Mobile Super 5w-30:
API Service Classification SN
Gravity, API 32.9
Specific Gravity 0.8607
Pour Point, °C (°F) -36(-33)
Flash Point, °C (°F), ASTM D 92 221(430)
Viscosity
cSt at 40°C 63.95
cSt at 100°C 10.7
CCS, cP 6,080 @ -30ºC
MRV, cP 26,800 @ -35ºC
Viscosity Index 158
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I run Mobil 1 0w40 in my SLK, but am going to try Castrol 0w40 next oil change. I hear they use Titanium.
mobilaltima, how long has it been since CIGARS has been gone?