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Your cart is empty.Yamalube 4M is a mineral-based four-stroke outboard engine oil that's an approved NMMA® FC-W® formulation specifically for use in the harsh marine environment. The FC-W® rating, which sets the minimum standard for outboard engine lubrication, corrosion protection, and resistance to potentially harmful effects of oil dilution caused by fuel, provides critical assurance that your outboard’s oil meets the minimum. Go it one better. Yamaha’s exclusive and proprietary additive package means Yamalube 4M meets or exceeds the industry standards for lubricity and corrosion protection. Automotive engine oil will not pass the rigors of the FC-W® test. In fact, most automotive engines cruise at 2500 rpm, whereas an outboard can typically operate from 4500 to 6000 rpm all day long. That kind of stress will literally tear automotive engine oils apart. Simply put, an automotive oil is not designed or formulated to provide the protection required by an outboard’s moisture-rich, high-rpm, high-load environment.
Customer
Reviewed in the United States on February 26, 2025
Been using in my outboard for years with zero trouble!
Placeholder
Reviewed in the United States on June 29, 2024
Ease of use, arrived when needed
Customer
Reviewed in the United States on February 22, 2024
Exactly what i needed at a good price compared to retail stores and marinas
Bruce Ramsey
Reviewed in the United States on October 9, 2024
Good price and packaging was good
Jay M.
Reviewed in the United States on April 4, 2024
I have had no issues using this product. I recommend it.
MIKE Z
Reviewed in the United States on August 13, 2023
Formulated for Yamaha outboard motors.
BillH
Reviewed in the United States on August 14, 2022
I have a 2001 25HP FS Yamaha outboard that I service myself. Given the high cost of these engines and how expensive they are to repair, I don't mess around with the oil or parts I use to maintain this engine. I only use Yamaha oil and filters. A few bucks more is worth the piece of mind to me. I also use Yamaha ring free fuel additive in my 5 gallon gas tank. I've never had any maintenance issues, and the engine still runs as if it's brand new. Buying these off of Amazon saves me a few dollars as well.
Customer
Reviewed in the United States on January 25, 2021
boat motor
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