Sinclair Conventional 10W-40 Motor Oil

Conventional Motor Oil Passenger Car Motor Oil

Sinclair Conventional 10W-40 Motor Oil is specifically formulated for the needs of older vehicles and/or higher-temperature climates, where thicker oils may be preferred. It offers the following:

  • Thermal breakdown resistance and deposit formation reduction, for better, longer-lasting engine protection than conventional oils provide.
  • Engine cleaning additives.
  • A strong film barrier that controls friction, resists wear and prevents contact between metal surfaces.

Conventional Motor Oil: Performance You'll Notice

Specifically formulated to give you:


Unsurpassed control of friction and wear.

  • Designed to work, even under the most severe, extreme environmental conditions and engine stresses.


A strong oil film helps avoid metal-to-metal contact, even under stress.

  • Excellentprotection against wear, with molecules that actually bond and prevent metal-to-metal contact of rotating engine parts.
  • Heat-activated friction reduction that forms a vital barrier that protects against friction in metal surfaces.1


Extends oil life by withstanding heat and shearing.

  • Excellent control of oxidation and deposits.
  • Keeps working and protecting, even in harsh conditions.

¹ To measure friction reduction benefits, engineers used the ball-on-disk traction test.


  • Provides performance benefits for passenger cars, light trucks and sport utility vehicles, including new and rebuilt engines.
  • Exceeds ILSAC GF-5 performance requirements.

Industry/OEM Specifications

API SN Approved
API SJ, SH, SG, SF Meets Requirements
API SL Meets Requirements
API SM Meets Requirements

Typical Properties

Boron, wt. % ASTM D5185 0.018
Calcium, wt. % ASTM D5185 0.132
Cold Cranking Simulator at (°C), cP ASTM D5293 4300 (-25)
Color ASTM D1500 3
Flash Point °C ASTM D92 208
Flash Point °F ASTM D92 406
Foam Seq. III (Tendency/Stability), mL ASTM D892 (Opt. A) 0/0
Foam Seq. II (Tendency/Stability), mL ASTM D892 (Opt. A) 0/0
Foam Seq. I (Tendency/Stability), mL ASTM D892 (Opt. A) 0/0
Gravity, °API ASTM D287 32.94
High Temperature Foaming, static foam ASTM D6082 (Opt A) 20/0
High Temperature / High Shear Vis at 150°C, cP ASTM D5481 4.02
Magnesium, wt. % ASTM D5185 0.043
Molybdenum, wt. % ASTM D5185 0.004
Nitrogen, wt. % ASTM D4629 0.086
Noack Volatility, % loss ASTM D6375 11.7
Phosphorus, wt. % ASTM D5185 0.077
Pour Point °C (°F) ASTM D5950 -39°C (-38°F)
Pumping Viscosity at (°C), cP ASTM D4684 33,800 (-30)
Shear Stability, Final Viscosity in cSt ASTM D6278 11.5
Specific Gravity @ 60°F (15.6°C) ASTM D4052 0.8605
Sulfated Ash, wt. % ASTM D874 0.92
Sulfur, wt. % ASTM D4951 0.3
TBN, mgKOH/g ASTM D2896 7.0
Viscosity @ 100°C cSt ASTM D445 14.83
Viscosity @ 40°C cSt ASTM D445 96.2
Viscosity Index ASTM D2270 161
Zinc, wt. % ASTM D5185 0.085

Container/Bulk Availability

6/1 Quart Product Number - 503-006