Join Date: May 2010
Location: Calgary, Alberta, Canada
At the high end, Amsoil 10W40 motorcycle oil.
At the cost conscious level, Rotella T4 15W40.
What's the difference? Well one costs significantly more than the other. If you change your oil regularly and pay attention to how you use your bike, ie, riding in very dusty conditions vs on the slab or in town, then there ios absolutely no difference but price. For a liquid cooled bike, people put way too oil much thought into oil, IMO. Some experience different shifting characteristics with different oils, or different clutch feel, and that's when you need to decide which you want to use. Some here use Walmart house oil and their bikes haven't blown up yet. There is a lot of information in that message alone.
When I had my VTX I used everything from Amsoil 10W40 bike oil to Rotella T3 (the forerunner of T4) 15W40. It all worked really well. I used Amsoil especially if I had a long trip scheduled. I wasn't sure if I would exceed the factory recommended drain interval. BUT, if IO were being completely honest, if someone else did the oil change, and put one or the other in, they could have lied to me about brand and I would have believed them. An air cooled bike is a bit different, but the VTX is happiest with regular service, regardless of brand. That said, 10W40 is what you need. Rotella 15W40 is fine for the summer or unless you plan on starting your bike cold in freezing temps. Anything 0W40, 5W40, 10W40, 15W40 should be fine. Part ofd the secret too is making sure it is JASO MA or JASO M2 rated. Many use oil that is not and their clutches are fine, but unless it's so rated, you don't really know for certain. Just my opinion.
'12 Road Glide Ultra, Kuryakyn Alley Cat intake, Jackpot Super Duals header, Jackpot HiRoller mufflers, PV Tuner, Daymaker LEDs