4 stroke oil

hi guys. Just wondering if any one can tell me if you can use car oil in your boat motor? Cheers Jadeo


scano's picture

Posts: 1060

Date Joined: 31/05/07

Sure can

Thu, 2017-12-14 23:17

 4 strokes are 4 strokes at the end of the day. You’ll probably even find that the “genuine” engine oil, is nothing more than standard engine oil rebottled.

 

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Posts: 152

Date Joined: 08/09/11

Agree with you.

Fri, 2017-12-15 05:59

But I personaly like to go to the best quality , usually synthetic, oils. Most motors are repurposed car motors anyway. I use car oil filters too when they fit.

Rob H's picture

Posts: 4866

Date Joined: 18/01/12

oils

Fri, 2017-12-15 07:58

 Really only the Hondas that are car engines as far as I know.

Suzies, Yams and Mercs are purpose built
Problem with car engines is the flywheel is on the wrong end for the usual outboard layout and the crankshafts arent strong enough to do both.

Oils-I just use good quality car oil 10W-40 in mine.

The advertising blurb will tell you stuff like "increased protection from salt water corrosion..."

At the end of the day, if the engine oil and seawater are coming in contact you have a way more serious problem than oil brand will fix

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The older you get the more you realize that no one has a f++king clue what they're doing.

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Date Joined: 08/06/15

Cheers fellas

Fri, 2017-12-15 09:03

i kind of figured that. Just needed someone else's thoughts. 

wangler's picture

Posts: 598

Date Joined: 26/04/08

I suppose you can

Fri, 2017-12-15 09:09

A marine engine spends much more time at high rpm and under a heavy load, so its oil is more prone to shearing. Other additives, That's why a lab certifies that marine oil meets the minimum FC-W spec.

The cost is not much more, a mineral oil will do the job, synthetics just last longer

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Rob H's picture

Posts: 4866

Date Joined: 18/01/12

true that

Fri, 2017-12-15 10:43

 but looking at the specs it lists

"These criteria include bench tests for viscosity, corrosion, filter plugging, foaming and aeration. In addition, the oil must successfully pass a 100-hour general performance engine test."

Which is much the same as any good auto oil anyway except it needs to demonstrated to the NMMA (and pay a fee no doubt)

____________________________________________________________________________

 Give a man a mask, and he'll show you his true face...

 

 

The older you get the more you realize that no one has a f++king clue what they're doing.

Everyone's just winging it.

 

Posts: 240

Date Joined: 13/08/11

What Wangler said is spot

Fri, 2017-12-15 10:44

What Wangler said is spot on... Oils aint oils. I certainly wouldn't be putting car engine oils into my outboards look at the specs required for an outboard and you won't find those specifications available in a car oil bottle.

Posts: 195

Date Joined: 15/01/10

 I was told 4 stroke outboard

Fri, 2017-12-15 14:11

 I was told 4 stroke outboard engines are based on motorcycle engines. With regard to oils it needs to meet the manufacturers engine specifications.

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Coastrunner's picture

Posts: 196

Date Joined: 25/10/14

Outboards might share some technology with bikes and cars

Fri, 2017-12-15 16:07

 But its a big stretch to say a 200Hp Suzi is based on a GSXR donk, totally different animals.

Synthetic outboard oil in my motor.

Posts: 226

Date Joined: 08/06/15

 Cheers guys. I put outboard

Sat, 2017-12-16 20:16

 Cheers guys. I put outboard oil in it. Stuff all difference in price anyway. I will say that the fuel filter price shocked me though. $52 for the smallest filter I have ever seen! Jeez they don't miss ya