PennGrade 1 Synthetic Blend 10W-40 is a high-zinc high performance oil for classic, muscle, and modern performance engines driven hard on the street and at the track. It blends a synthetic component with premium base stocks to hold film strength under heat and RPM, with a ZDDP anti-wear system aimed at performance valvetrains and heavy-load bearings. This listing is for a case of four 5 quart bottles.
Specifications:
- Product: PennGrade 1 Synthetic Blend High Performance Oil SAE 10W-40
- Viscosity grade: SAE 10W-40
- Oil type: Synthetic blend
- Zinc: ~1,500 ppm (0.15 mass %)
- Phosphorus: ~1,400 ppm (0.14 mass %)
- Anti-wear: High-zinc ZDDP additive system
- Viscosity index: 154
- Flash point: 400 F (204 C)
- Pour point: -43.6 F (-42 C)
- Typical use: Classic, muscle, and high-performance street and race engines; turbocharged and non-turbocharged
- Package: Case of Four 5-Quart Bottles
- Part number: 71440
Important: PennGrade states this high-zinc oil is not recommended for use in vehicles equipped with catalytic converters.
FAQ
Is this a full synthetic or a blend?
It is a synthetic blend (partial synthetic) high performance oil.
Does PennGrade 1 10W-40 have high zinc?
Yes. It uses a high-zinc ZDDP anti-wear package, about 1,500 ppm zinc and 1,400 ppm phosphorus, which suits flat-tappet cams and performance valvetrains.
Can I run it in a car with a catalytic converter?
PennGrade does not recommend this high-zinc oil for vehicles equipped with catalytic converters, because high ZDDP levels can shorten catalyst life.
How is this listing packaged?
This listing is a case of four 5 quart bottles. It is also stocked in other package sizes (5 Quart Bottle).

