Ok everybody! I've been using H-D 20-50 synthetic motor oil in my 2007 FLHR since my 500 mile Oil change. I've been thinking of changing to Mobil 1 20-50 synthetic for air cooled motors. But I've heard a lot of good things about the Royal Purple 20-50 oil for H-D. Just wanted to throw it out there, Anyone use Mobil or Royal Purple? I have 34,000 miles on my bike and haven't had any issues yet. Any feedback will be appreciated! Thanks! Oh yeah do I have to get a Royal Purple oil filter for my bike is I switch to the Purple?

From what I can find the Royal Purple is the best. Started using it last year in all 4 bikes.

Never heard of it. Do yo get it at the local auto parts store.

Never ran Purple, Run AMSOIL in both bikes and love it...... Runs cool and have NEVER had any type of issues.

I've ran nothing but Royal Purple in my bikes. Makes it easy for a change you can run it in all 3 holes.

and for the filter no, I just use the $5 fram filter you can get anywhere.

all 3 !.

Take this for what it cost you.

http://www.blackstone-labs.com/newsletters.php?ID=63 />
p.s.: I use HD oil because if anything goes wrong I enjoy the thought of suing HD. Synthetic oil is great but in my opinion, if you change oil regularly, for most riding in non-desert temperatures it is a waste of money.

Royal Purple, Amsoil, Mobil 1, and Rotella T Syn (what I use) are all great oils.

extreme, you run the rotella t syn, i ued the rotella t15w40 in my business servicing semi's and that was a freekin great oil, the syn is better? i would drop oil at 10k on a semi and it would be black, but slick as hell, and it was a conventional.

Yea Bro, I run the T Syn in everything I have. Scooters, tractor, truck, the wife's Z, boy's trucks, etc. One oil covers everything.

Been using the Rotella Syn since my first oil change ('05 Suzuki Boulevard C-90). Awesome oil and only 19.00 a gallon at Wallyworld !!! (That and a K&N Filter)

Amsoil is the #1 Synthetic Oil.

I'd be interested in scientific analysis and explanation of why this is so. 

jb

I run Amsoil in mine, but I have heard good things about Royal Purple from the guys I ride with.

https://www.amsoil.com/products/streetbikes/WhitePaper.aspx />

https://www.amsoil.com/products/streetbikes/WhitePaper.aspx />