Yep another one of these. The recommended oci for my f250 with its non turbo diesel is 2500 miles. It has castrol 15w40 it it. Currently @ 3100 miles on the oil and filter. Mostly 2-4 mile trips. Let it go or drain it?
Change it or let it go.
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4WD
$50 site donor 2025
How long in the motor?
Two to four mile trips? Isn't that murder on oil?
Originally Posted By: 4WD
How long in the motor?
3 months or so
How long in the motor?
3 months or so
The most important thing is WHO is going to pay the bill if your wrong on this decision. I would not worry about it till you hit 5 to 6,000 miles or 6 months.
OK, so warm Cali (on most days) and the engine still does not get up to temp much because of the short trips ... Diesel, so less concern about fuel dilution. Does it start up readily and run well? Do you put your foot in it going up hills on your 4 mile trips? Severe service ...
This is a 7 or 8 qt system isn't it?
Out of warranty?
Pull a sample and send it in via Napa Store. If the oil comes back good, you have documented evidence to not change. If fuel diluted to much, you know what to do ...
This is a 7 or 8 qt system isn't it?
Out of warranty?
Pull a sample and send it in via Napa Store. If the oil comes back good, you have documented evidence to not change. If fuel diluted to much, you know what to do ...
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Originally Posted By: BrocLuno
OK, so warm Cali (on most days) and the engine still does not get up to temp much because of the short trips ... Diesel, so less concern about fuel dilution. Does it start up readily and run well? Do you put your foot in it going up hills on your 4 mile trips? Severe service ...
This is a 7 or 8 qt system isn't it?
Out of warranty?
Pull a sample and send it in via Napa Store. If the oil comes back good, you have documented evidence to not change. If fuel diluted to much, you know what to do ...
8 qts is the low mark.10qts is full.]Been out of warranty since around 1988. It does not have a turbo so its always being over fueled.
OK, so warm Cali (on most days) and the engine still does not get up to temp much because of the short trips ... Diesel, so less concern about fuel dilution. Does it start up readily and run well? Do you put your foot in it going up hills on your 4 mile trips? Severe service ...
This is a 7 or 8 qt system isn't it?
Out of warranty?
Pull a sample and send it in via Napa Store. If the oil comes back good, you have documented evidence to not change. If fuel diluted to much, you know what to do ...
8 qts is the low mark.10qts is full.]Been out of warranty since around 1988. It does not have a turbo so its always being over fueled.
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Oils today are very much better than in 1987, so without a UOA it's all guesswork and speculation.
Yes I know the truck doesn't owe him anything, and oil is cheap insurance.
Yes I know the truck doesn't owe him anything, and oil is cheap insurance.
A fellow 6.9 idi
They say 2500 severe 5000 normal. My truck is usually hauling stuff when I take it out so I change mine at 3000. 2-4 miles isn't even probably getting her up to temp, I would change it at 3000 but that is just me. Also you can run the FL1995 powerstroke filter if you want it holds an extra quart bringing you to 11.
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dnewton3
Staff member
I would reccommend a UOA.
Either invest in a sample device (suction tube or a Fumoto valve), or just OCI this time and then use the info for the next OCI.
Why guess when you can know?
Either invest in a sample device (suction tube or a Fumoto valve), or just OCI this time and then use the info for the next OCI.
Why guess when you can know?
Originally Posted By: Roost426
A fellow 6.9 idi
They say 2500 severe 5000 normal. My truck is usually hauling stuff when I take it out so I change mine at 3000. 2-4 miles isn't even probably getting her up to temp, I would change it at 3000 but that is just me. Also you can run the FL1995 powerstroke filter if you want it holds an extra quart bringing you to 11.
I have used the long filter before but it's made by purolater and I don't trust them any more. Someone here sent me a whole bunch of short idi filters so I'm using those up.
A fellow 6.9 idi
I have used the long filter before but it's made by purolater and I don't trust them any more. Someone here sent me a whole bunch of short idi filters so I'm using those up.
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Oh, come on Chris! That 2500 mile recommendation was for '87 oil! And if your original book probably shows API /CD oil. [censored] compared to today's HDEO, hence a lower OCI.
Some of my old UOAs are probably on here somewhere and I went as high as 8K miles (with a bypass filter) and 5.5K before the bypass. The make or break point was soot. In most other areas the oil was fine and that's where the 3um bypass helped by catching a lot of the soot. Old school IDI diesels are a lot like the modern EGR trucks... they tend to be soot monsters. Each engine manufacturer has a prescribed soot limit and offhand I don't know what that limit is for the 6.9L. 2-3% is a generally good number with a well found HDEO. In my 6.9L, it took more than 5K miles to reach that 3% limit. My old Farmall (Neuss diesel) was about 120 hours. With the bypass on the 6.9L, I usually reach the 3 year time limit before I reach the soot limit.
Anyway, get a UOA. If you go Blackstone, look at the insoluables but other companies can list soot directly.
A lot depends on how you use the truck. If you work the truck, it's going to generate more soot. When you work it hard enough to see black smoke out the tailpipe, it's going into the oil at a higher rate. They often equate soot generation with how much fuel is used and hard work eats more fuel... and vice versa.
Check here: https://bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2122499> Doug Hillary had some interesting things to say about soot.
Some of my old UOAs are probably on here somewhere and I went as high as 8K miles (with a bypass filter) and 5.5K before the bypass. The make or break point was soot. In most other areas the oil was fine and that's where the 3um bypass helped by catching a lot of the soot. Old school IDI diesels are a lot like the modern EGR trucks... they tend to be soot monsters. Each engine manufacturer has a prescribed soot limit and offhand I don't know what that limit is for the 6.9L. 2-3% is a generally good number with a well found HDEO. In my 6.9L, it took more than 5K miles to reach that 3% limit. My old Farmall (Neuss diesel) was about 120 hours. With the bypass on the 6.9L, I usually reach the 3 year time limit before I reach the soot limit.
Anyway, get a UOA. If you go Blackstone, look at the insoluables but other companies can list soot directly.
A lot depends on how you use the truck. If you work the truck, it's going to generate more soot. When you work it hard enough to see black smoke out the tailpipe, it's going into the oil at a higher rate. They often equate soot generation with how much fuel is used and hard work eats more fuel... and vice versa.
Check here: https://bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2122499> Doug Hillary had some interesting things to say about soot.
Run it out to 6k, then run the oil analysis. Don't waste your money on doing one at 3k, modern oils have no problem of doing that. I estimate it can do 8k easy but only UOA will tell really.
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