A couple months ago I dumped the factory tranny fill on the RT and put in Mobil 1 75/90 GL-5 rated gear oil. The manual recommends straight 90 weight or 80/90. A lot of other RT drivers are using the 75/90 or the 75/140 and reporting smoother shifting. My shifting was OK at first (I didn't really notice a drastic improvement), but has gotten progressively harder to downshift when cold over the last few weeks.
The first 20 minutes of riding is very difficult because of the awkward downshifting--it feels almost like the tranny is DRY. As soon as it warms up, the shifting is normal and very smoothe. And before you ask, I've double-checked the fluid level in the tranny--it's right at spec.
Is the problem aggravated because of the colder ambient temps (45-50 F) we've had, or is there something else going on that isn't related to the Mobil 1 gear oil? Would the Mobil 1 75/140 likely cure this problem? I'm leery about using the 75/140 because the manual doesn't spec that weight and the bike is still under warranty.
Thanks in advance for your opinions!
Rob
The first 20 minutes of riding is very difficult because of the awkward downshifting--it feels almost like the tranny is DRY. As soon as it warms up, the shifting is normal and very smoothe. And before you ask, I've double-checked the fluid level in the tranny--it's right at spec.
Is the problem aggravated because of the colder ambient temps (45-50 F) we've had, or is there something else going on that isn't related to the Mobil 1 gear oil? Would the Mobil 1 75/140 likely cure this problem? I'm leery about using the 75/140 because the manual doesn't spec that weight and the bike is still under warranty.
Thanks in advance for your opinions!
Rob