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Product Details

Sierra 4 Stroke oil is specially formulated for the demands of marine and outboard engines. 10W-40 is a blend of premium grade synthetic and mineral oils with superior designed additives formulated for the extreme rigors of the marine environment.

These additives boost corrosion protection and lubrication. Outperforms standard 4-cycle automotive engine oils in marine applications, with excellent detergency, anti-oxidants, anti-wear, and corrosion protection.

The benefits for marine engines include reduced wear of internal components, corrosion protection for internal parts, cleaner pistons, and prevention of ring sticking. Excellent low temperature operating properties. Meets or exceeds quality performance API SJ, CF-4, CH-4. Recommended for use in all outboard manufacturers.

Reviews for Sierra 10W-40 Synthetic Blend Engine Oil

2 of 2 Reviews

December 11, 2014

Good Value
By Jerry from Tallahassee, Florida

Verified Purchase

I have used Sierra outboard oil for several years. It's a good value and protects your outboard at a good price.

Bottom Line Yes, I would recommend to a friend

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November 13, 2014

Superior Customer Service
By Jerry from Tallahassee, Florida

Verified Purchase

I use this product in my four stroke outboard motor. Sierra oil and products are well know in the marine industry and are known for quality and durability. I have used this type of outboard oil for several years and have had good results.

Bottom Line Yes, I would recommend to a friend

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