Quote Originally Posted by know1 View Post
First of all, thank you so much for the many replies from everyone. I really appreciate it.

I'm going to look ignorant here - mostly because I am ignorant about this - but the motor is a 1998 Evinrude Intruder 150HP. On the serial plate, it says to use TC-W3.

So I guess that was the information I should have posted originally.

The true definition of ignorance is being un educated. 1998 was the last year Evinrude made a carburated motor. In 99 they came out with the Ficht and somewhere around 02-03 they redisgined the Ficht and re named it E-tech. Now that you have your education you have nothing to be ashamed of LOL.

With the rating TC-W3 you can use any of the Evinrude oils or any oil that meets or exceeds TC-W3 specifications. Like I said earlier if I were to use an Evinrude oil it would be XD100 but due to cost I run Amsoil HP Injector. Run what oil you want but going 100% syenthic would be a wise choice. If you choose something other than a syenthic oil I recommend running a fuel addative to help combat carbon.

BTW one can argue that the 150 Intruder was one of the best small block motors that Evinrude ever made. They are not as fuel efficent as a Ficht or E-tech but they are very strong motors that are almost bullet proof if they are well maintained and took care of.