Thought I'd try my hand at researching some specs of the oils I'm interested in for the Jeep:
Current
Valvoline MaxLife HDEO 15w40 -
Typical Properties
SAE Viscosity Grade 15W-40
Density, 15 C, g/mL 0.870
Viscosity @ 40 C, cSt 116.7
Viscosity @ 100 C, cSt 15.5
Viscosity Index 140
CCS Viscosity @ - 20 C, cP 6500
Borderline Pumping Viscosity @ - 25 C, cP Pass
High Temp. High Shear Viscosity @ 150 C, cP 4.35
Noack Volatility, % loss 8%
Pour Point, deg. C -30
Sulfated Ash, % <1.0
Total Base Number (D-2896) 10
Foam / Aeration Test Pass
Next test:
Castrol Edge 5w30 HM -
Typical Characteristics
Name Method Units Typical Values
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
Also looked up a few other oils, but copying/pasting the info came out hideously, so I've omitted quite a few.
What numbers here should I be looking out for with the Jeep?
The Valvoline MaxLife 15w40 is 15.5, which may be why I feel it is sluggish. My guess is something between 12-13 would be good for the Jeep, but I've no real knowledge of these numbers and what they pertain to. I'm trying to learn though!