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It's vitally important to select a high-quality oil that matches your engine's recommended viscosity. If it's not conveniently printed on the cap, as was the case for our Colorado, you'll find the info in the owner's manual. We went with Royal Purple's 5W-30 High Performance motor oil, but if you seriously stress your engine they also offer XPR Extreme Performance Racing. We added the recommended quantity of oil, waited for it to drain to the pan, and then fired up the engine for a few minutes before checking the oil level again and inspecting for leaks.