As you can probably tell, I am a first time diesel owner. I have a 07 Mega Cab 3500 with a 5.9 CTD.I am looking for input on when to change your oil. According to the dealer, they say it should be changed every 12000 km. My Father-in-law has a 05 F-350 and his dealer recommends he change his oil every 6000 km. I e-mailed Cummins and they said to follow the vehicle manufactures recommendations. 12000 km seems like a long time between oil changes. I have just under 8000 km on the truck and looking for some advice as this will be its first oil change.

 

I change oil and filter every 5000 with Shell Rotella 15-40.

 

For me every 5,000 miles with Valvoline Premium Blue (cause it has a big C on the label)and either a Mopar or Fleetgaurd filter.

 

First change was at 7500 miles and now I will change every 15,000 miles now that I am on Amsoil DEO and AE filter.

 

Every 5k, I use Shell Rotella.

 

I also use Valvoline Premium Blue every 5k miles.

 

welcome to DF...


I went the 15k once on Amsoil... it was supposedly good for up to 25k but the oil didnt make it (oil analysis). came back contaminated at the 15k mark. flushed it, refilled with mobil delvac and resampled at 2900 miles and came back clean. So now on the next oil change @ 5k I'll be going back to Amsoil and swapping at 5~7500 mile intervals. oil is cheep compared to a rebuild.

 

I used castrol syntech last week when spilling a gallon of it on the floor

 

I wasnt aware that castrol had an oil suitable for the diesels... when did this oil come out? and what weight oil is it?

 

I change mine around every 7500 miles with good old Shell Rotella 15W-40. With the new CJ-4 spec oil I try my best to stay under 9k miles on the change.