I had good luck with the same oil in my old 22r toyota and my kubota diesel mower. I've used it for 25k now and doesn't seem to burn off. I know opinions differ on Royal purple, some hate it, some seem indifferent other than the price and some praise it so one would think they are drizzling it on their pancakes. Once it's warm I do tend to put my foot in it from time to time. I generally let the truck idle to warm-up 8-10 mins before a trip and my commute usually runs 22miles to work. It never gets below 20f here and rarely that cold. I tow about every other weekend and nothing real heavy then. ![]() I"ll be changing it today at 45k and taking a sample for my first uoa. I use the motorcraft filters and ran Rotella T6 til 20k then started using Royal purple 15w40. Bottom line, even heavily modified turbo EJs will live as long as its possible to make them live on RT6. The thought being that operators of commercial fleets can reduce their inventory to just one oil. I'll extend that when the warranty is done. Rotella T6 is a 'fleet' oil meaning it meets the requirements for both gas and diesel oils. While it has a power train warranty I change oil at 5k intervals. Needless to say I was eager to change it myself. Duralec Ultra is fortified with a high level of zinc/phosphorus anti-wear additive and Royal Purple's proprietary. Royal Purple Duralec Ultra motor oil is specifically formulated to maximize performance and meet the demands of today's heavy-duty engines. The reminder sticker on the glass claim they used 5w40. Motor Oil SAE 15W-40 5 Gallon Maximum Performance Motor Oil. ![]() ![]() Royal Purples API licensed motor oil delivers superior protection and improves performance in gasoline and diesel engines. Royal Purple recommends waiting until the manufacturers first scheduled oil change in new gasoline engines before upgrading to Royal Purple. When I questioned them about 5w20 in a diesel they assured me they filled it with 15w40. Royal Purple motor oil is fully compatible with mineral or other synthetic oils. I bought the truck new and the dealer provided the first o/c free, but listed 5w20 on the invoice. Results Royal Purple 05154 API-Licensed SAE 15W-40 High Performance Synthetic Motor Oil - 5 Gallon 775 16299 (0.25/Fl Oz) List: 181. I'm second guessing my choice of Royal purple 15w40 for my 2011 6.7 powerstroke.
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