Shell Rotella (Registered Trademark) T Triple Protection (Registered Trademark) Oils provide triple action to help control wear, deposits and emissions to continuously adapt to the needs of your engine for protection in on-and off-highway applications. It meets or exceeds API CK-4 requirements, and is designed to provide extra performance. Shell Rotella (Registered Trademark) T Triple Protection (Registered Trademark) performs well in both older and new engines.