When replacing your oil, it is always important to use the proper weight and type. Using improper oil can cause your engine to run rough, use more fuel and even result in a catastrophic engine failure. For the Ford 6.0L Powerstroke engine, there are a couple of different weights of oil that you can use. In addition, you can find these oils from several different brands.
When you are choosing the weight of oil for your 6.0L Powerstroke, you should always consult the owner’s manual for your vehicle. Typically, Ford recommends 15W-40 or 5W-40 for these engines. The 15W-40 is typically recommended for summer usage, while the 5W-40 is more appropriate during the winter and colder weather.
There is also a question of whether to choose a synthetic oil over a conventional oil. Most diesel experts will tell you that the 6.0L runs just fine on conventional oil. You can run synthetic oil in these engines with no bad effects, but your engine’s performance will not improve by much, if at all. Most Powerstroke owners opt for conventional oils for the cost savings they provide.