I normally change the oil and filter at 5k miles using delo oil and a motorcraft filter. Not towing can I go 7k?

 

if its just a daily driver with no towing or hard running I'd say you'd be fine.

 

You can always get a sample of the oil tested.

 

Mine's a daily driver, and I go 5K on the oil and filter, 10K on the fuel filter, and 15K on the air filter. I do check the air and fuel filters at every oil change and drain the fuel bowl. My brother does a lot of heavy towing, so he operates on 3K intervals for oil, oil filter and fuel filter. He changes the air filter about every 10K...He's well over 400K miles on his truck, and just had to replace his original injectors. His truck runs like a top! It's bone stock!

 

It all depends if you drive alot in the city, or mostly highway.
This isthe oil change intervals I do in the fleet, mostly city
4k oil chnages and oil filter
Delivery truck 05 6.0 tow heavy most of the time
4.k oil change oil filter
Delivery truck highway only
5K oil changes oil filter
All Motorcraft oil filters and this oil

 

i get oil analysis every change. blackstone has been telling me to go 10k miles for quite some time now. i still change it at 7000-7500.
i use valvoline all fleet 15-40 they now call it premium blue heavy duty diesel 15-40

 

Hey,I'm not the only one using it!!!!!

 

Change oil every 18,000/20,000 miles. Amsoil full flow 25,000 mile filter, FS2500 By-pass 3/m oil filter. oil analysis every 10,000. Amsoil 15/40 diesel/marine HD oil.

 

This just me, but I am **** about oil in a PSD. In other diesels that just use the oil for engine lubrication, I think 5000-7500 mile changes are fine. But, with the HEUI system, the oil is the life of the injectors also. Like I said, this just me, but I change my oil and filter every 3000-4000 miles. My truck is not a daily driver, and when I do drive it, it is usually towing heavy, so 3000 mile changes aren't really breaking the bank for me, and it gives me that warm fuzzy feeling inside

 

I use it to i stock up on it when it goes on sale 15 bucks off when you buy 3 gallons lol

 

I shoot for the factory 3000-mile specified interval on my '96, which is dedicated to towing. I have observed that when the oil has 3000 miles or more on it, my engine takes a few extra revolutions before it starts, compared with when the oil is fresher. I assume it's the injectors liking fresh oil better than used.