PENN GRADE1 10W-40 Synthetic Blend Engine Oil — 5-Quart High-Performance Protection Under Heat

PENN GRADE1 10W-40 synthetic blend is a high-performance engine oil formulated to protect heavily stressed street and racing engines while improving horsepower through reduced internal friction.

Built from premium PennGrade base stocks and advanced additives, this SAE 10W-40 synthetic blend (part number 71440) delivers dependable lubrication where high temperatures, shock loads, and extreme torque are routine. Packaged in a 5-quart container, it balances robust film strength with shear stability so engines maintain protection under sustained heat and pressure without sacrificing performance.

How does this oil defend engines under high heat and heavy loads?

PENN GRADE1 10W-40 resists thermal breakdown and keeps a stable lubricating film at elevated temperatures. Additive chemistry minimizes foaming and maintains viscosity so bearings, camshafts, rings, and pistons stay protected during severe use.

• Thermal protection against oil thinning during extended high-RPM operation
• Anti-foaming agents to sustain consistent oil pressure
• Strong film strength to prevent metal-to-metal contact under shock loads
• Shear stability to preserve viscosity after mechanical stress

Will this oil improve engine efficiency or power output?

This synthetic blend reduces internal friction with a lubricating formulation designed to lower resistance between moving parts. While results vary by engine and condition, many users notice crisper throttle response and measurable reductions in mechanical drag.

• Friction-reducing additives for smoother moving parts
• Consistent viscosity for predictable power delivery
• Helps maintain clearances that influence horsepower output

Is PENN GRADE1 10W-40 suitable for street-driven and race-tuned engines?

Yes — it’s engineered to meet the demanding needs of both high-performance street vehicles and many racing applications. The formula provides wear protection for high-stress components while remaining stable across common operating temperatures.

• Formulated for heavily stressed engines, including street/track use
• Protects bearings, cams, pistons, and rings under torque loads
• Meets the lubricating demands of modern and older performance engines

What are the practical details about packaging and service intervals?

The oil comes in a 5-quart container (ideal for most passenger cars and many light trucks) and is compatible with typical drain-and-fill service procedures. Service intervals depend on driving conditions and vehicle requirements; consult your owner’s manual for manufacturer recommendations.

• 5-quart size for single-service fills on many engines
• Part number 71440 for easy identification and reorder
• Compatible with routine oil change procedures; follow OEM service intervals

Who is this for? Automotive enthusiasts, track day drivers, and owners of performance street cars seeking a reliable, high-temperature-capable oil will benefit from PENN GRADE1 10W-40. It’s aimed at users who demand strong wear protection, reduced friction, and stable viscosity in a synthetic blend that performs under strenuous driving conditions. If you need a 5-quart, race-ready lubricant that balances protection and efficiency without the full cost of some full-synthetic options, this formula is a practical choice.