PennGrade is a brand of lubricants, specifically motor oils, known for their high-performance and heritage in classic and vintage vehicles. The brand is a product of D-A Lubricant Company, which acquired Brad Penn Lubricants, the oldest continuously operating lube oil refinery in the U.S. PennGrade 1, the flagship product, is often referred to as "The Original Green Oil" due to its distinctive color and high-zinc, high-phosphorus formulation, which provides excellent protection for older engines with flat tappet and roller cams.
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