Hey JB, 50:1 or 24:1

[KentuckyBoy67]

I was told by my Marine Mechanic ( 25 years under his belt )to mix it 50:1 on my old TD-20, 1946-49 <br />5 hp Outboard Johnson Seahorse.<br />But what I've seen on here I should be mixing 24:1. <br />What do you think?

 

[JB]

Re: Hey JB, 50:1 or 24:1

The TD-20 has several sleeve (friction) bearings.<br /><br />OMC specified 24:1 for all engines made before 1964. This can translate to all engines that are not 100% frictionless (ball or needle) bearings.<br /><br />Many believe that modern TC-W3 oils are better lubricants than the SAE-30 used back in those days. They are, but they don't protect sleeve bearings any better.<br /><br />Some get away with using 50:1 in the old engines, some don't. I wont recommend it.<br /><br />Use 24:1.<br /><br />Good luck.

 

[Chinewalker]

Re: Hey JB, 50:1 or 24:1

Definitely run it at 24:1. JB's right on the money about the bronze bearings needing extra oil to live happily. Any mech who tells you to run 50:1 is looking at selling you a newer motor down the road...<br />- Scott

 

[KentuckyBoy67]

Re: Hey JB, 50:1 or 24:1

Thanks guys!!<br />I will change to 24:1.