Synthetic oil, slick 50 and Yamaha?

[Swifty]

Is synthetic oil okay to use in a Yamaha F80 4 stroke and has anyone used slick 50 (or similar additives) in an outboard.

I don't have a manual and would be grateful if someone could let me know what Yamaha suggest, or your experiences.


Many thanks,
Tim.

[codprawn]

Don't touch slick50 or similar with a barge pole. I have seen inside engines that it has been used in and the gunk that builds up is horrible.

I don't see the point in synthetic oils either. They are good if you don't plan on regualr oil changes. I would rather a normal oil and change it a bit more often.

[Blizzard]

use the genuine Yamaha oil,
have done for years, and it certainly gives good piece of mind.
Never had a problem
never use any additives

[Pete7]

If you search the internet you will find the Slick 50 parent company were found guilty in the US for mis advertising/desription on the box and had to set aside $26m to cover compensation.

Pete

[codprawn]

Originally Posted by Blizzard

use the genuine Yamaha oil,
have done for years, and it certainly gives good piece of mind.
Never had a problem
never use any additives

Any good quality engine oil will do - do you use Honda oil in a Honda or Ford oil in a Ford???

[two stroke mick]

note if you use syntic oil once you are stuck with it. I understand that you cannot revert to ordinary oil if syn oil has been used in a engine.