...not to split hairs...especially since I agree with most of what has been said on this thread. I run Amsoil and can tell a diff with my 07. However, the statement that an oil cooler can't hurt isn't 100% true...you do need to have a minimum operating temp for the oil...I think its 180 degrees. So...you'd want to be able to by-pass the cooler during colder ambient temps.

Just sayin...

 

In my case the HD Super Premium oil cooler 62895-03B has a thermostat.

 

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With any oil cooler you need to use a thermostat
Quigley

 

I had the same reply from the local HD service manager. Syn oil was a waist of money. We have had a few days in the mid to upper 80's so far, my oil pressure drops to about 5 psi, the engine idle drops and the bike starts the vibrations. Makes me wonder about the synthetic oils. My next change will be to a synthetic.

[IMG]local://upfiles/28484/068945649D8046A7A8CE317D5AEA56A0.jpg[/IMG]

 

OR a manual bypass valve.

 

I don't understand how anyone could claim its a waste of money in an air cooled engine. It doesn't break down like dino oil. It protects your expensive investment and allows it to run cooler.

 

Yesterday my boy and I chased each other through the mountains for 250 miles. I was pushing pretty hard, keeping the tach between 4 and 5K, and really hammering through the gears. I stopped to check just once, and for the second time in the bike's life (a 2007 Deuce) I peaked out at 230 degrees. That's the hottest I've ever gotten it to, and I don't baby it. I would NEVER consider anything but a good synthetic.

 

People been bangin through the mountains for years on Dino. Just ran 2,861 miles in 6 days and 1/3 of it was the Blue Ridge, Skyline Drive and Deals Gap. Ran most of this stuff at 3-5,000 rpms the balance was interstate at 75-90. No problems and all on Dino. You don't have to run these engines on synthetic, they been running for 100 years on fossil oil. If you live in Death Valley or Phoenix and change oil every 7,000 miles that's a different story. Just change it frequently and run em. (The new 96/6 may be an exception. From what I am hearing/reading, they run very hot).