Conventional Motor Oil

Passenger Car Motor Oil

Conventional Motor Oil

Sinclair Conventional Motor Oil is designed for older vehicles and/or high temperature climates, whenever thicker oil is preferred or recommended.

The additive system is technologically advanced and includes detergents, dispersants, viscosity improver, anti-wear and anti-friction agents, as well as oxidation and corrosion inhibitors.

The Sinclair Protection Your Vehicle Deserves

Sinclair Motor Oil has been meeting the challenges of balancing protection, endurance and toughness for over 100 years. Today, as always, it provides outstanding protection at a great value.

Sinclair gives you reliable protection against friction, wear and thermal breakdown mile after mile.

Sinclair Conventional Motor Oils: Performance You'll Notice

Our conventional oils have been specifically formulated and designed to provide:


Outstanding control of friction and wear.


Provides a strong oil film to protect rotating engine parts, even under extreme stress conditions.


Extends oil life by withstanding heat and shearing.

Typical Properties

Viscosity Grade Conv 10W-30 Conv 10W-40
Boron, wt. % ASTM D5185 0.02 0.02
Calcium, wt. % ASTM D5185 0.099 0.099
Cold Cranking Simulator at (°C), cP ASTM D5293 5300 (-25) 6100 (-25)
Color ASTM D1500 3 3
Flash Point °C ASTM D92 220 237
Flash Point °F ASTM D92 428 459
Foam Seq. III (Tendency/Stability), mL ASTM D892 (Opt. A) 0/0 0/0
Foam Seq. II (Tendency/Stability), mL ASTM D892 (Opt. A) 0/0 0/0
Foam Seq. I (Tendency/Stability), mL ASTM D892 (Opt. A) 0/0 0/0
Gravity, °API ASTM D287 31.33 31.71
High Temperature Foaming, static foam ASTM D6082 (Opt A) 20/0 0/0
High Temperature / High Shear Vis at 150°C, cP ASTM D5481 2.97 3.99
Magnesium, wt. % ASTM D5185 0.059 0.059
Molybdenum, wt. % ASTM D5185 0.0079 0.0079
Nitrogen, wt. % ASTM D4629 0.087 0.087
Noack Volatility, % loss ASTM D6375 12 11
Phosphorus, wt. % ASTM D5185 0.077 0.077
Pour Point °C (°F) ASTM D5950 -42°C (-44°F) -39°C (-38°F)
Pumping Viscosity at (°C), cP ASTM D4684 18,000 (-30) 30,000 (-30)
Shear Stability, Final Viscosity in cSt ASTM D6278 8.58 11.5
Specific Gravity @ 60°F (15.6°C) ASTM D4052 0.869 0.8670
Sulfated Ash, wt. % ASTM D874 0.92 0.92
Sulfur, wt. % ASTM D4951 0.3 0.3
TBN, mgKOH/g ASTM D2896 7.0 7.0
Viscosity @ 100°C cSt ASTM D445 10.56 14.96
Viscosity @ 40°C cSt ASTM D445 68.37 107.3
Viscosity Index ASTM D2270 142 145
Zinc, wt. % ASTM D5185 0.085 0.085

Industry/OEM Approvals

Title Conv 10W-30 Conv 10W-40
API SJ, SH, SG, SF Meets Requirements Meets Requirements
API SL Meets Requirements Meets Requirements
API SM Meets Requirements Meets Requirements
API SN Meets Requirements Meets Requirements
API SN Plus Meets Requirements Meets Requirements
API SP Approved Approved
Chrysler MS-6395 Meets Requirements -
GM 6094M Meets Requirements -
ILSAC GF-4 Meets Requirements -
ILSAC GF-5 Meets Requirements -
ILSAC GF-6A Approved -