I live in Canada and store my oil in an unheated shop. Twice I have cracked open a new 5 gal oil pale, dumped it into an engine and had table spoon sized ice chunks come out. The oil is good quality but the pales allow moisture to get in. Use a screen.

I use this twice a year changing out all my motorcycles oil. Never had a problem, last as long if not longer then the more expensive motorcycle oils for tappets. I can tell I need a change when the gear dogs click louder than normal. I get about 2500 miles out of a change in my old air cooled shared sump bikes. I'm sure I could go longer, oil still looks nice when I drain it. I just prefer to change it at manufacturer intervals. I then use the used oil in my mowers for a half season of more. Have one mower that's been going strong for 11 years, still doesn't smoke and starts every time. Wouldn't trust anything else in my old fleet of tappet head bikes.

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!

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.

Although this product has many modern applications, I use Rotella 15W-40 and 10W-30 in all my antique tractors that call for 30 and 40 weight oil. It's much better than what they've been run on for the bulk of their life and has no doubt extended the lives of their old engines.

Best price out there.

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

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.

I have been using this product for a few years on my semi-trucks so far. I have 1 with 750,000 milage. Other ones have about 900,000 to 1million with no problem best product I have had in a while for cat engines.