Did some research, and found out that the T6 15-W40 oil has all the necessary certifications to be used in a motorcycle, even with a wet clutch. This oil is a quarter as expensive as the Castrol or Motul oils I was running before, and at least around 2k miles in, it seems to run just as well.

As a 6.7 cummins owner that hauls a 12,000lb 5th wheel I trust my Ram to get me where I want to go and not worry about my motor. I have used nothing but Rotella T6 and will let my consumption guage get to 15% life left before I change the oil and filter. After driving 7,000 miles and changing it I could still feel the heaviness to the oil so I know this oil isn't breaking down prematurely. I won't trust my engine to anything but this oil

I have 146000 on my f350 recently replaced all the injectors, when we pulled the valve covers off I was impressed they looked like new no sludge or anything. I remember 40 years ago my father in law told me to use shell Rotella if you want a clean engine. He was right.

I've been using T6 in my 2005 Kawasaki Vulcan 1500 after my first oil change, this oil takes the heat and keeps the inside of the motor spotless. No clutch slippage at all. The perfect oil weight to get into the tight clearances and reduce the 50w power and mileage rober.

Love this oil in my ATV. Turns smooth as silk. Some may question, why it's a diesel oil. Why you putting that in a quad. Trust me its JASO certified. Which is why I use it. Check it out and read up on all the reviews. YouTube has alot on this oil for motorcycle oil. I highly recommend

This oil completely stopped the cold start surging on my 2000 7.3 Powerstroke F350, even at below zero without being plugged in...(I am often out of town where I cannot plug in). With regular 15w40 RotellaT, it would not start at all below about 25 degF unless plugged in. With the Rotella T6 5w40 synthetic, it starts, even below zero, without being plugged in....and no surging at all. I assure you I am not employed by Shell or Rotella, I just love this oil. I only run it in the winter though, with 190,000 miles on my truck, I figure the regular Rotella is good enough for summer...as you know the synthetic Rotella gets expensive when you are buying 4 gallons.

I've been using T6, 5w-40 in my Terex diesel mini-excavator for four years. Cool runner and easy starts in cold weather. No engine problems or abnormal noises. Price is good with the rebate program. As an aside, I'm wondering if the motorcycle guys may have a "wet" clutch which normally requires a NON-synthetic oil.

Used Rotella T6 in an 2004 F-150 with 200,000+ miles that was having camshaft phaser issues. The semi-sythetic 5W20 recommended oil would not hold 20 psi at the camshaft. Went to full sythetic T6 - 5W40 oil and the phasers worked fine. Used this oil through a full winter with temps down to -20. Pick-up started fine all winter. Kept it another 12,000 miles and traded it the next summer. Never had another issue with oil pressure. Also use it in my diesel side by side. 5W40 is recommended in that utility vehicle for all temperature so it works year round.

I think that this one of the best oils on the market for trucks like mine as well as all of the new ones being built today. Why should we not use all of the newer oils to make our older Diesels last longer, if they help the new trucks, they should really help our older trucks that have some age on them and are still being used every day, for work, pleasure driving an just to have around. Mine has 268000 miles on it and I hope to put a Million Miles on it, if I live that long.

I use T6 5W-40 for all non catalyst engines from small engines to tractors and older gas trucks. I live in ND where the temps range from -30F to 100F in a season and this oil has performed excellent in both gas and diesels. The only thing that sucks is the ZDDP will smoke o2 sensors in newer vehicles so I quit using it there. Nice to have one oil do the job of three.