2015 FLHXS, 37,000 Miles.
I have noticed a bit of clutch drag on my last couple of rides, complete 3 hole oil change about 2,500 miles ago.

I have added about a 1/4 of quart of oil to the crankcase, I'm using the same oil for all 3 holes.

When I put the bike on my lift to check out the primary, I removed the derby cover and about a half a quart of oil spilled out.

Definitely smells like engine oil,

I was hoping someone could explain how this is happening?

 

Since you use the same oil in all three holes, makes sense it smells like motor oil. Check your transmission level.

 

Transmission oil is clean and level has not changed, I'm wondering how engine oil can migrate to the primary case.

 

The sprocket shaft seal is leaking.

 

Since you use engine oil in all 3 holes, the oil in the primary has to smell like engine oil, that`s what it is...

Replace sprocket shaft oil seal and spacer, items 13 and 19 in the illustration.

Illustration

 

Thanks again for sharing your experience, I was looking at the FSM , and I agree,
I just finished installing a new regulator, stator and compensator along with a new clutch basket and cable on my FXDF, I thought I was going to be able to put my tools away for a little bit, first world problems,

Thanks

 

You didn't by chance remove and forget the spacer under the compensator?

That leaks a big coincidence if you just completed that other work.

 

Thanks, but I was writing about my Dyna.
my bad.

 

I finished the work on that, and then I discovered the issue on my street glide

 

About the only way motor oil can migrate into motor is through the crank seal. There could be a porous case. One issue that can be exacerbated if the issue is a plugged motor vent. It happened to a guy over on HTT when the installed the new style head vents in a twincam. Is there anything thing you've done in that area. Rerouted head vents? If not replace the mainshaft seal.