Ok, so @ 7,070 miles, today, it told me to change oil soon. I have logged 7k in 5 weeks, since ownership. Would it hurt to go until 10k miles? What are your guys' take on this?

 

It will eventually say 'Oil Change Required' and then you should do it at your next convenient time. Right now is a good time to shop for and purchase the oil filter and the oil that you want.

 

While it probably wouldn't hurt I'm not sure why it's worth the risk. Lots of folks have been extending drain intervals over the manufacturer recommendations with the help of oil analysis, but it's never a good idea unless you have taken oil samples and have a good idea of how well oil holds up under your driving style.

Most on here will also tell you that you should change the oil to get rid of the break-in wear metals as well.

 

Cool, we have inventory of the oil filter, fuel filters. We are going to use Rotella T 5W-40 since we already have a few cases laying around. : )

 

Oh, I wanted to change the oil @ 1k miles, just didn't make the time. Not into extended drain intervals either, just feel so bad that I rack of the miles so quick, that I was hoping I didn't get that messages for another 3k miles. It'll be interesting to see how the long the Rotella T will run.

 

It'll go just as far as it would if you used any other kind of oil. The oil life monitor has no clue as to the type or condition of your oil; it goes by the usage of the engine and calculates when the oil should be used up.

The truck doesn't care whether or not you use cheap store-brand oil or expen$ive Amsoil; it assumes that you use cheap stuff. So if you have a good quality synthetic you probably have more time after the oil change light comes on before you do engine damage.

 

Changing the oil is one of the cheapest things you can do to prolong the life of your engine. Not sure why you would want to stretch it out as far as you can?

I change mine every 5k no matter what and I don't have all the emissions crap diluting my oil with fuel and soot.


It's your truck though, do as you wish.

 

I just do it when the truck tells me and that's usually around 7500 miles. I'm not wasting money on 5000 mile intervals anymore.

We all have our opinions and I don't think any of it really makes a difference, just do what makes you happy.

 

My changes have been at 5K; I am just over 20K now and will have had the truck 1 year Friday. The first two changes had fuel dilution reported back in the oil analysis; the last two have been good.

I use the synthetic Rotella T; have since 2004. Probably a waste of money, but, to each his own.

Point is, if you have any fuel dilution; then 10K might be pushing it.

Engine is suppose to be able to determine fuel dilution; this was true on the later updates to the 6.4 as well. I know when I had fuel dilution on my 6.4 there never was any alert though; so just how much it would take I don't know. If you search and read there are auto manufacturers that quote some pretty high amounts of fuel dilution being okay. I think in most of our minds we don't want any!

Interesting note. Recently got latest version of AutoEnginuity; found a PID for oil level. I had just changed the oil at 20K mark and poured in 12 quarts; the level (a few days later) reported was 12.2 quarts. My level is at the lower end of the hash mark on the dip stick. I have been unable to find anything about how oil level is calculated in the Factory Service Manual; in fact it doesn't even list this PID. I suspect it is based on temperature rise of oil vs rise of coolant temperature. There was some discussion on this in the 6.4 forum in the past (see post #9 by Dr. Rik); who presents another explanation.

https://www.ford-trucks.com/forums/1...-in-regen.html

I will stick with 5K oil changes for my own peace of mind; if this engine had a ninth injector I would go the lesser of 10K or oil life monitor.

Bob

 

Change my oil when truck tells me to also.