The Difference Between GL-4 and GL-5 Gear Oil The main difference between GL-4 and GL-5 gear oils is in the level of extreme-pressure (EP) additives. It’s really very simple. They are not interchangeable and GL5 didn’t replace GL4. by Eddie
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Our Diesel Fuel Additives Will Save Your Fuel System and Add Performance New diesel owners are not being told this critical information from the dealership. Adequate diesel fuel lubricity is essential for protecting the highly engineered components in modern diesel