93 0ctane or 87

[beeble_bobble_booble]

I was told from the guy that s

I was told from the guy that sold me my 2003 50 hp 2 stroke to run just 93 octane but someone just now told me to run only low octane. Which one is correct? Also I just drained the gear oil and only got about 8-10 oz. of fluid. Is that low? I know I need to pump it back in until it runs out the top but how much and what weight should I purchase?

 

[beckerjs]

"[url=""]http://www.mercurymar

"http://www.mercurymarine.com/otherproducts/maintenance/gearlubehp.php
fill it back up till it overflows, 10 oz sounds about right, the engine is in the down position right?

87 oct is fine

get the operators manual and service manual"

 

[galamb]

"Don't run the 93 Octane.

"Don't run the 93 Octane. It is called for in some of Merc's very high horse motors but not yours.

The high octane is achieved through a number of additives that are not very friendly to most outboards.

The only time I would ever put it in a tank is following winter storage. Properly stablized gas will lose some of it's octane rating during extended storage. So for most of us, adding about 10% by volume of 93 Octane in the spring and mixing it up well, kinda revitalizes that old gas you have had sitting all winter - because low octane is almost as bad as high octane in an outboard.

Best practice is to use "fresh gas" (less than 3 or 4 days old) each outing."