What type of oil do i put in my mercruiser 470?

Question

What type of oil do i put in my mercruiser 470?

Answer 1

Go with the 25W40 like the dealer recommends.

Answer 2

If you are in a spot that has variations in temp like the Northeast you should use 5 or 10W - 40. Double check with the owners manual if you have one. If its cold out and you use a straight weight oil the engine will crank slower and possibly not get good oil right away on start up.

Answer 3

Straight wieght

Answer 4

The previous answers are fine, but MerCruiser's engine oil that you can buy in quarts (I purchase it in bulk 55 gal. drums for my marina) is actually 25W40 oil. This is because a boat engine sees around 70 to 80% load ALL THE TIME when it is running vs. a car engine that sees anywhere from 20 to 40% load.

Answer 5

SAE30