Have used this oil for 20 years to maintain three successive Sierra 3500 Duramaxes. I noted an improvement in mileage when I first switched over and have never experienced a single wear related engine issue even beyond 200,000 miles.

Used it twice so far in 2002 Jetta TDI. Usually use Castrol Syntec 5W-40. But I like this product as well and it has a nice price tag at Wal-Mart. Jetta has about 185K miles on it. Wal-Mart also has the three pack for about $60, which makes for about a $30 oil change (remember for a Jetta almost 5 qts are needed- $20 for the gallon + about $6-7 for 1 more qt +oil filter).

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 a 17 year old Volvo TAMD41P-A diesel in my 31' recreational trawler. Prior engine oils for the prior owner (11 years) and me have been 15-40 dino oils, until I switched to full synthetic engine oil, also 15-40. Operating temperature dropped 5 degrees at standard cruising RPM of 1800 to 2200 (only one of two thermostats in place most of that time), the engine runs quieter and more smoothly. Based on research I have found, I know that my engine is running cleaner, with other attributes of reduced internal corrosion, less wear, etc. After installing 2 new thermostats, the engine runs precisely on specification for operating temperature through the full range of RPM, right up to wide open throttle, 3800 (end of the day 10 minute spike to clean the exhaust system ). Further, smoke when starting is greatly diminished to almost zero. I am completely satisfied that I am doing all that I can to accomplish optimal engine performance and protection with Rotella T6 over the last two years, and I am comfortable recommending Rotella T6 to boating friends with diesels, confident in the cost/benefit of using the best oil quality, grade and viscosity for my application.

Used T6 in my 2007 FZ1 since I bought it used about four years ago. I rev this bike to the Max, never had a single engine problem, doesn't run hot, uses zero oil in between changes. I understand that it shears easily in a wet clutch situation (as do many oils) so I change it as I reach about 1k or 1.2k miles that way the engine always gets fresh oil. It's cheap and not that hard to change oil and filter. I only ride for fun so I change it maybe a couple of times a year.

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 have used this in both my 1997 f250 7.3 and my 2005 f250 6.0 with no adverse issues at all. Best level of oil for the price before you start considering the Amsoils and Redlines that cost double. As long as your sticking to a routine schedule of changing the oil and filter, the Shell T6 will do more than its part in taking care of your engine and its internals. If your trying to go over 10k miles in between oil changes step up to the top of the line oils and pay the premium, but thats on you. Use genuine Ford filters with this and your golden. But i cant stress this enough, stick to routine maintenance intervals for your truck and they will last you hundreds of thousands of miles. Also always compare between walmart and amazon cause they go back and forth in who has the cheaper prices.

Synthetic oil is always best for you vehicle. The Rotella T-6 has finally been added to Fords approved list of oils. In 2017 many vehicle manufacturers changed acceptable rating for approved oils and after much debate over the matter T-6 was added to Fords list.

I have been using this in my 3.0L EcoDiesel since the first oil change; better oil pressure than the OEM oil, and Chrysler has since made this the recommended oil for that engine. 10K mile oil change intervals, doesn't use a drop. Starts fine in cold weather too (only down to -10F here in Texas...). PS: I cannot imagine why someone would use a Diesel oil in a motorcycle.

Rotella t is one of the best diesel oils ever. And Walmart has the best prices on it AND they will deliver it to the house? Critical for someone like me who has disabilities. Walmart's delivery service is more than a convenience, it is a lifeline for those with disabilities.