Sierra 18-9559CAT-3 10W-40 Full Synthetic Marine Engine Oil - 1 Gallon

Sierra 18-9559CAT-3 is a premium 10W-40 full synthetic marine engine oil designed specifically for high-performance marine and powersports applications. This advanced formula provides superior protection against wear, oxidation, and thermal breakdown in demanding marine environments.

Key Features:

• Full synthetic formulation for maximum engine protection and performance
• 10W-40 viscosity grade suitable for a wide temperature range
• Excellent resistance to thermal breakdown and oxidation
• Superior wear protection for critical engine components
• Helps prevent deposit formation and engine sludge
• Compatible with both inboard and outboard marine engines
• 1 gallon (128 fl oz) container for convenient refills and oil changes

This full synthetic oil delivers exceptional lubrication in both freshwater and saltwater marine applications, helping extend engine life and maintain optimal performance. Ideal for boaters who demand the best protection for their marine investment.