Using unleaded fuel

[brawny1]

New 9n owner here and I have heard that it is ok to use unleaded fuel in my tractor due to the hardened valve seats etc. Is there any truth to this? Also , any suggestions for a multi viscosity oil for the engine?

Thanks for the help,
Brian in Massachusetts

[jamesfpop]

The valve seats are hardened and no lead is fine.

Rotella is what I use, can't remember the vis. though.
JP

[dyoungen]

Rotella, isn't that for Diesels?

[jamesfpop]

Read on another forum that the detergents in the rotella multi vis is excellent for the tappets.

The viscosity depends on the condition of the engine.

I am not the expert, but if the thing maintains good oil pressure≈lower multi vis numbers/colder climates and SAE 30-40-50 for warm climates

Do some more internet research and decide which way you want to go.

With aircraft we always used phillips X/C until we got a new engine, then went with shell multi vis. It was air cooled, but the technology is 40's era for both.
JP

[jamesfpop]

Using sae30 and will continue.

Doing a proper oil change tomorrow and have decided to go with Multi vis 10w-30. Seems noone in the family has changed the oil in the poor 9n in forever. NOT GOOD! Will still use Rotella though.