If you live near an O'Reilly Auto Parts store they are currently running a special on Rotella 15w-40, I just bought 9 gallons at about $12.50 per gal.
Im running Spectro as well, I always ran Rotella in my quads. Im going to give it a try once Im out of Spectro.
Rotella T6 5w-40 full synthetic. I run it on everything but the Ural and have had nothing but good things to say about it.
Good news, local O'Reilly's actual has oil higher than 30W! Yes they had that oil on sale for $19.99G, regular price is $28/G (these things vary by location)... and they also had the stuff that Kelly mentioned (Mobil Delvac 1300 Super 15-40 Diesel Oil) and the regular price on that is $18/G. In addition they also had Mobil 1 of reasonable weight (15W-50?).. They even had Lucas Motorcycle oil...so now I know where to find oil in Napa. Since my interest is a long term product to use, I did not buy any other oil, because I want to see how the "Castrol 06412 Power RS Racing 10W-50 4-Stroke Motorcycle Oil" I got from Amazon works out, which was $30/G delivered. Though I just re-checked and it seems to have gone up to $32/G.
I used that in all my KTM's, and their 10w-60 Power Synt is factory recommend for the big block Guzzis. Great stuff. I have some on the shelf, will be happy to use it in the Terra. At $18/liter, an oil change in my Stelvio NTX wasn't cheap - but an air/oil cooled motor with a hot running head needs the best, so I followed their recommendation (Agip 10w-60 also recommended). On the Terra I will buy a full synthetic in the recommended viscosity and change it based on the conditions it was ridden. I have no brand loyalty - I've used every oil out there, and really have no preference. I have bottles of Silkolene, Motul, Mobil 1 15w-50 full synth, Golden Spectro... on my shelf. If I start with an ester based oil, I will stay with it though. Not sure why, but I'm sure a petroleum engineer will be happy to tell me if I need to or not My XR628 was always in a dusty environment and got ridden hard - I used Castrol GTX and changed it often. I'm of the school that you can go to Pep Boys and buy Manny, Moe, and Jack's oil if you change it as often as motorcycle people tend to.
I just picked up oil and filters for my first at home oil change on this bike. Went with Motorex full synthetic in the weight specified in the manual.
Mobil 1 15W-50 4T Racing Oil @ $14/Litre. I use Mobil oil in all my vehicles, just a personal preference.
FYI, Rotella T6 5W-40 can be had at Advance Auto right now for $13.99 and there is still a $5 rebate available which should be applicable. Can't beat $9 for a gallon of the good stuff. Link to Advance auto: http://shop.advanceautoparts.com/we...X3_0_0_0&cm_mmc=aff-_-cj-_-4485850-_-10711125 rebate: http://www.shell.com/rotella/promotions/t6-spring-promotion.html
Last change I used Motul 10w40. It's much easier to click into neutral now than with Silkolene 10w40.
Another O'Reilly Auto Parts Rotella fyi.... Rotella T Heavy Duty Motor Oil T10-30 T15-40 $12.99/Gallon Limit 12 Units Rotella T6 Synthetic Heavy Duty Motor Oil SYN5-40 $22.99/Gallon Limit 12 Units
