The Turbo Diesel Register did an in depth analysis of a wide range of died engine oils,including some very pricey synthetics. I had just purchased my first diesel,a '02 Dodge 24valve Cummins,and was researching what oil to use. I run Amsoil products in my Harley and was surprised to find that the Rotella T ranked in the top 5 of this analysis. It can be viewed on the Geno'garage website /Tech information. I change my oil at 10k mile intervals and I am sure if I had it tested, it could go further. Great product.

I have been running Rotella 15W-40 in my Mercedes 300 Turbodiesel for years. Unlike what the instructions say about a 5,000mi oil change, I change my oil every 3,000mi. The car now has 528,000mi on it without overhaul yet! I also use Rotella 15W-40 in a pickup with a 454 engine pulling a 11,000lb chorus trailer.

I was concerned when I heard shell discontinued production of Triple Protection Rotella. This is my second oil change with this oil and I run it for 5000-7000 miles. UOA show great additive packs and the wear metals in my samples have decreased since the change to T4. Great oil and a great company. I've been using Rotella since the Rotella-T days.

My 1994 F350 7.3L with 270k seemed to idle a little rougher running T3 but when I took the leap on running T4 I couldn’t be happier. My diesel runs like a brand new truck and no more leaking! My truck has been brought to a new level with Shell Rotella T4 15w-40 ! Very excited to see how she runs the next 3 to 4k miles ! Definitely an eye opening experience in my journey with this truck .

My 1979 Volvo 244 DL with 231000 km has been treated to Shell Rotella T4 10W30 since Sept. 7, 2019, odometer at 215477. The overhead cam/valve sound is quieter at 3000 R.P.M. on the 400 series highways at 100 km/h. The rear crankshaft oil seal has stopped seeping oil this year. I used to use synthetic oil. I can experience that Shell Rotella T4 10W30 oil really agrees with the 2.1 L, B21 A naturally aspirated gasoline engine. These are long-lived engines, and anything I can do to prolong its life is appreciated. Thanks, Shell engineers, for the extra protection of Z.D.D.P. for the camshaft lobes!

Wrong oil

Who picked the 2.5 gallon container size... obviously they don’t change their own oil. My truck requires 13 quarts... normally 3 gallons and 1 quart. Stupid

Been using in my tractor trailers for over 40 years and over 5 million miles. Never had an oil related failure. There are newer and more expensive oils o in t there, but it’s hard to argue with success…

This is the only oil I have run in my 2001 Ford F-250 Superduty 7.3 diesel. I now have 248K miles on it and it runs like it was new. I would never try any other oil..

I and many others I know use this oil because it has the high zinc we need for flat tappet cams. I have a 1972 Plymouth Roadrunner with a 440 and so far no problems.