I have a 2007 Softail Deuce, 96CI, 6 speed. It was broke in and run on mineral oil the first 20,000 mile. I have been told I cant switch to synthetic because it will start leaking. Is using semi-synthetic and option of should I just stick to the good ol' mineral oil?

 

Total bs - you can run synthetic. Ignore the uninformed person telling you that you can't. If a bike has weeps/leaks/seeps, it will typically show up more with synthetics but synthetics do not cause leaks. If it does have weeps/leaks/seeps, that's gaskets and sealing, not oil.

 

+1. Run either one you want. Ride safe.

 

MIGHT have been true decades ago when things still used cork gaskets... but now, no way.

 

I was going to give you all your answers, but then I realized you were talking about the oil in softail.

 

Thanks for the help, she doesn't leak a drop now so I will try the synthetics.

 

You are using a modern bike (2007), I dont understand in the year 2018, because there are people using mineral oil nowday in modern motorcycles.
Repair the gasket to fix the oil leak and use synthetic .

 

 

Because they only put few hundred miles on a year, change it soon,because only thing they know how to do, or are cheap.

 

If you switch from dino to syn there's a good chance you'll hear more engine noise, especially from the top end.

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