For classic car enthusiasts, hot rod owners, or anyone running a flat-tappet camshaft engine, this Driven HR-5 oil is a top-shelf choice. It's a conventional 10W-40 weight motor oil formulated with a high level of zinc (ZDDP) – an essential anti-wear additive that protects older engine designs, especially during startup when oil pressure is low. It meets military storage specifications, offers excellent seal compatibility to prevent leaks, and is made right here in the USA. If your engine builder or manual recommends an oil with elevated zinc content for proper break-in or ongoing protection of lifters and cam lobes, this is exactly what you're looking for. One quart bottle. Always check your owner's manual or with a mechanic to ensure this is the right oil for your specific engine.
