We've used this oil in our previous boat and our current boat. Our old boat had the 4.3 V6 in it and the new one has the Mercruiser 4.5 V6. We've never had any engine issues with either boat. They both had good oil pressure with no engine noise aside from the expected. Even after it sits for a while I've never heard any lifter noise or anything like that when I first fire it up.
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
8.1 mercruiser - 1300 hrs
By 
CHRISTOPHER, 
a 
Verified Buyer 
from 
Tampa  
on 
October 22, 2021
Best oil marina oil on the market. Using oem oil my engines would burn oil every trip . Changed to amsoil instantly stopped consuming oil. Also holds better oil pressure .
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
Amsoil Marine Engine Oil
By 
JOHN, 
a 
Verified Buyer 
on 
September 23, 2021
Switched to Amsoil 25-40 in my Mercruiser 454. It seems to hold better oil pressure than other oils I’ve used. I would recommend this oil.
Bottom Line
Yes, I would recommend this to a friend.
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3 star rating
Great Oil lousy Shipping
By 
Glen, 
a 
Verified Buyer 
on 
September 23, 2019
This is some of the best oil available for Mercruiser engines that I have ever used. The three star rating is for the shipment. Half the bottles were leaking oil from the caps. Enough to soak thru the boxes. Neighbor had the same problem with motor oil delivery.
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5 star rating
Great value
By 
Bryan, 
a 
Verified Buyer 
on 
July 17, 2019
Switched my marine big block over to Amsoil 25w-40 and have seen better oil pressure and increased performance over 30w oil. I'll definetly use this oil again.
I purchased tis for my mercury, and i cant say enough about it, I have enjoyed using the amsoil product in everything i have and i will continue the use of it
I ran this in my mercury optimax 125. It ran cleaner and smoother than when running on the mercury oil!
Bottom Line
Yes, I would recommend this to a friend.
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