Customer Ratings & Reviews

This oil immediately cured the low oil pressure problem in my outboard. Motor sounds great, runs great. The lower end also performs well with the 75-90 Marine Amsoil gear lube. I run Amsoil in every motor I own including those in my cars from the forties and fifties and I have for decades. Great stuff.

Been using Amsoil in my truck and my boat and love the product. 2021 Chevy Trail Boss, 1966 Bertram 25" twin 3.7L Mercruisers. Going to start using the marine gear oil next.

Dhipping was fast, price was fantastic, used this their products in my boat and motorcycle. No isdues.

Switched from Mercury Marine 25/40 synthetic blend to amsoil Marine 25/40 blend over the last several years I've been switching everything over to Amsoil a little bit more money given the price of automobile engines truck engines and Marine engines it's a small price to pay for top quality product they always have fast shipping very happy and you know where the product comes from Superior Wisconsin yay USA made

Break in complete on new 2025 Mercury 90 outboard Out with the Mercury oil, in with Amsoil. c”,)

Shipped immediately was extremely happy

Used this oil in my Mercruiser 350's for 1 season So far so good . Better value than mercruiser's oil and easy to locate and buy. Definitely using from now on.

Very good Martine engine oil for mercruiser engines, only upgrade that could be made is having 1 liter bottles instead of 1quart

Good quality oil

Seems on par or superior to mercury oil. Will see next year when I change it but maintaining warranty and half the price of the alternative and a brand I trust is with the try.

Seems to perform better than oem oil. Fast shipping.

It is impossible for me to rate the quality and performance of this engine oil as it would require equipment, technology and scientific knowledge that I do not possess. The only thing I can say is that it turned up and I put it in the boat. Anything beyond that would be speculation on my part (Rating - I don’t know; Would I recommend- I don’t know). If Amsoil wishes I can send them a sample of the oil at the end of the boating season and they can run the appropriate tests to determine if the oil is still functioning to their specifications. Review complete!

Originally I was using too light of an oil and I went to this 25W40 and was very happy with the oil pressure increase and now it doesn’t seem to go through any oil. Big block Chevy

The oil is awesome. Customer service SUCKS! I called and asked 3 times on the live chat to get info for an oil filter for my Merc Pro XS 150.....NO RESPONSE!. Check your owners manual and then go a Merc rep to get the oil filter. Apparently AMSOIL doesn't update or do any type of referencing when looking up parts that we can service ourselves

Great Oil. Have used it on my 1998 7.4 MPI Bravo 3 since it was first offered. Very little oil consumption. No smoke; engine have been running great with good oil pressure at idle at operating temperature.

We've used Amsoil in both of the boats we've had and neither one ever had any issues. They quietly fire right up and purr like a kitten going across the water. I'll never use anything else.

I trust all of Amsoil products and I am using this in my Mercuriser IO cheaper than Quicksilver and I'm sure its a much better oil.

Engine runs smooth.

My 150 Merc runs smooth and and cool

Not pure synthetic as the name states, its misleading because this is a synthetic blend not %100 pure.