Joe Gibbs HR-3 is a synthetic 15W50 oil which is suitable for older style pushrod (OHV) engines and has been developed to provide increased protection for camshafts. The synthetic formula provides a higher level of protection on startup compared to mineral oils. HR-3 also includes additives which protect against rust and corrosion even when the engine isn't running. This makes it ideal for classic cars which aren't used as daily drivers.
Ideal for cast iron V8 engines or older engines with looser tolerances.