Synth3 is thefactory fill for all CVO Harleys.

Those two mechanics, if they indeed said that, are completely wrong. Some myths just simply will not die. Amazing. I have run nothing BUT synthetic in my Harley twin cams.

 

I too have always ran synthetic, AMSOIL. But it's a pain the butt joining up every couple of years, ordering 4-5 cases of oil, and still paying a pretty high price.
I'm going to switch over to the 15w50, thanks all...

 

https://www.hdforums.com/m_1379162/m...tm.htm#1379162

 

i have 66K on my 2001 RK and has has the 15W50 every 2500 miles. there is not enough difference in parts per million of the additives in 15W50 and 20W50 V Twin to warrant the extra cost. my engine has been opend up twice for cam changes and there is no unusual wear visible. and you can find 15W50 anywhere.

 

there is no evidence to prove this anywhere. LOL.

 

Think about it.....adding friction to oil??? Friction creates wear. Friction creates heat.

 

sorry 'bout the bad info. I had the same thoughts that's why I asked at the dealership. I kikn't even think of checking it out on the forum.

In my daily rider's owners manual (yeah it's metric, till I can afford another HD) it states specifically not to use energy conserving III oil due to loss of friction for the clutch operation. I run mobil 1 in that bike, and have had no problems with it.
This is the only reason I gave any credence to the synthetic oil reccomendations at the dealership.

once again sorry about the bad info.

 

No problem with that info, as you're obviously open-minded and are willing to listen to other ideas on the subject. It's just that the skating-bearing myth was never based on reality, as I've never seen or even heard about any evidence of it. I have no idea how it got started.

There's no problem with a energy-conserving oil in the HD engine since engine, tranny, and primary fluids are all separate. OTOH, energy-conserving oils are usually, if not always, lower-visocity varieties like 5w30, etc.--rarely has high as the HD spec (20w50). An oil rich in anti-friction additives is good for the engine and tranny, but not the primary where the clutch disks are housed. In the primary all you need is a cheap 10w40 fossil engine oil, and IMO anything more expensive is overkill.

 

Have an 08 Ultra. Put 15W -50 Synthetic Mobile I in at 500 miles. Rodein temps up to 105 degrees and down to 30 degrees over a period of 8000 miles.The bike is still running so how can anybody say that this oil is not any good? $21.00 for 5 quarts is not bad either.

 

I use 15w50 mobil one in my 08 SG engine and primary.. Use "mopar" brand 75w10 synthetic gear lube in trans. Works like a charm!