So, with only 4,800 miles on the motor, I should wait to run synthetic?
I was told at the dealership that the new 6. 7L Cummins comes with Synthetic oil already installed, so you would need to continute to use synthetic oil.
I would like to use the less expensive Premium Blue, but if the engins already have synthetic you will need to keep doing so.
FATCAT,
Where did you hear that you must continue to use synthetic after you start?
This is the first I've ever heard of such a thing, and I don't think that's right. Please enlighten me.
Thanks,
Loren
I received an E-mail from Cummins on 8-17-07 and I will include the exact info that I received.
WHAT TYPE OF ENGINE OIL IS REQUIRED FOR THE 6. 7-LITER TURBO DIESEL?
The new cummins 6. 7-liter Turbo Diesel engine requires low-ash engine oil with a maximum 1. 00 mass percent content of sulfated ash. Failure to use this type of oil can result in serious damage to the exhaust aftertreatment system in the vehicle. Cummins Turbo Diesel engines are filled at the factory with Valvoline's Premium Blue engine oil. Owners need to be sure to purchase API-CJ-4 engine oil that meets Cummins Engineering Standard CES 20081, such as Valvoline's Premium Blue. End of Quote.
I did have(can't find it at the moment) where Cummins signed a 5 year contract in 2007 for Valvoline to supply them the Premium Blue CJ-4 oil.
For you die hard oil fans out there. That oil test that i have mentioned before was done in one of the TDR issues about three issues ago. Valvonline Premium Blue was recommended by the TDR people to run in our trucks over all other oils. synthetic, rotella, amsoil, and a bunch of others. The TDR people came up with Rotelle on the bottom of the list. I work for Shell and i have no problem telling anybody it sucks