Engine oil

[INTENTS]

I was as the store the other day. I see that there is an oil for aging cars. Is this wise choice to put in aging marine engines?:huh:

 

[Moose]

Never put auto oil in your marine engine, period.

 

[INTENTS]

I have always been hesitant to use synthetic oil. Is'nt there a complicated process to change over. Don't you have to make sure ALL the old oil is out of you engine because regular oil and synthetic oil don't mix?

 

[Captain Crispy]

Nope. Just warm the engine up, drain the old oil, put in synthetic. They sell dino/syntho blends, so obviously they mix.

 

[JVM225]

The "High Mileage" stuff is a blend. I use the Valvoline (in the red jug) in both my boat motors and in my classic muscle car. I usually buy it in Wal-Mart.

 

[djboots]

I use Mobile 1 15W 50 high performance oil. I like to go with a heaveier weight oil because the boat is not ever ran in really cold weather and is under a heavier load. Marine or not i think mobile1 is the best oil that can be put into any engine. Everyone will have there own opinion of course. You can never go wrong with mercs suggested oil though. If your unsure just put in what they reccomend.

 

[Nacho Boat]

DO NOT use automotive oil in your boat!!!!!!

Automotive oil does not have corrosion prohibiters. (additives) Use your manual as a guide as to which oil is preferred. What ever you use, make sure it is rated with API service ratings of SH, CF or CF-2. Personally, I use Mercury's synthetic oil in my 8.1's, which would be an excellent choice for your 7.4L

Royal Purple also makes a good synthetic marine oil from what I understand, as does AMSoil.

I have heard this often, and I really don't understand this.

The inside environment of your engine on a boat should not be any different than the inside of your engine on a car (at least the parts that are lubricated with oil). Why are the corrosion inhibitors different in boat motor oil? I drive in Florida, and our outside environment (read intake air) is very moist year round. I cannot imagine that the motor oil I use in my car being exposed to a different environment?

So....(without flaming)...can someone explain to me where all this water (causing corrosion) is supposed to come into my boat motor, that would be any different from a car motor?:huh:

I understand that boat motors work much harder than car motors. I used synthetic 15W-50 in my last boat (which is what was recommended by V-P for their motors, if the SAE40W was not available). V-P was more concerned about using a synthetic motor oil.

Thanks!

 

[djboots]

I have heard this often, and I really don't understand this.

The inside environment of your engine on a boat should not be any different than the inside of your engine on a car (at least the parts that are lubricated with oil). Why are the corrosion inhibitors different in boat motor oil? I drive in Florida, and our outside environment (read intake air) is very moist year round. I cannot imagine that the motor oil I use in my car being exposed to a different environment?

So....(without flaming)...can someone explain to me where all this water (causing corrosion) is supposed to come into my boat motor, that would be any different from a car motor?:huh:

I understand that boat motors work much harder than car motors. I used synthetic 15W-50 in my last boat (which is what was recommended by V-P for their motors, if the SAE40W was not available). V-P was more concerned about using a synthetic motor oil.

Thanks!

Agreed!!!! That is like saying if I got a hold of 2 corvette motors and put them in my boat that I need to start using different oil.

 

[Lazy Daze]

A car also gets used every day. Which means it is constantly "burning off" (I use that term loosely) the moisture. A boat has a good tendency to sit for easily a week or two (or more) at a time. At least, that's the way I always thought about it.