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FYI: You wasted a bunch of money doing oil changes every 3K miles. A BUNCH.
Personal attacks AND WRONG!
I change engine oil about 3 K and all my engines run like new with new oil pressure at 320 and 400 THOUSAND miles.
Oil must be changed when the additives are spent or contaminated, when its " dirty" not at any soecific mileage.
This " specific mileage " meme is ignorant of the fact that oil change intervals depend in service category, severe service, stop and go, hauling, require more frequent oil changes.
I've personally seen 10Rxx and 10Rxxx transmissions go south under 70K-80K., and the general consensus was that the fluid should have been changed far more often than what Ford "recommends".
Beyond that, there's a significant difference between changing your trans fluid every ~35K miles and changing you oil every ~3K miles.
Advising someone that they are wasting money by changing their oil too soon is not a personal attack.
A personal attack would look something like this: "You are a frigging idiot for changing your oil too soon."
See the difference?
AND WRONG!
You subjective opinion is duly noted. However, I prefer to take advice from those who actually analyze engine oil versus an anonymous Interwebz forum user.
Ideally, you should have your oil analyzed. That is THE best way to determine if you can extend or need to shorten your OCI.
With my '17 PSD, I sent a sample from every oil change off to Blackstone Labs. Their recommended OCI for me on that vehicle usually hovered around ~10K or so. And with the 9th injector in my '26, I expect to see even longer recommendations.
I change engine oil about 3 K and all my engines run like new with new oil pressure at 320 and 400 THOUSAND miles.
That's wonderful. That doesn't mean you weren't changing your oil sooner than you could have waited. I could change my oil every 100 miles and make the same claim as you are, but that doesn't mean 100 miles is the correct OCI.
Oil must be changed when the additives are spent or contaminated, when its " dirty" not at any soecific mileage.
Again, an oil analysis is the best way to determine what OCI you should be following, as it takes into account how YOU drive and how YOU use your vehicle.
With the high cost of just oil and filts for the diesel. Makes sense to spend money on oil analysis. You might be able to easily go 6000 miles on oil changes. Or maybe not.
100% spot on.
Unless someone has Superman x-ray vision, they cannot see what's going on inside their engine. Other than disassembling and inspecting it prior to every oil change, an oil analysis from a competent organization is, IMHO, the best way to determine the correct OCI for you truck, your driving style, your driving conditions, and how you use your vehicle.
Oil must be changed when the additives are spent or contaminated, when its " dirty" not at any soecific mileage.
.True... But, when IS that...??? Almost certainly NOT at 3,000 Miles with todays oils, IF you use 100% synthetic high quality name brands... So far I have done 4 oil analysis tests for the last 4 oil changes, at 16,000Kms/10,000Miles each, (basically when the oil minder said 0 oil life left) and every one of them came back saying the oil was still good... For ALL my driving scenarios, I would consider them to be under the severe driving conditions banner...
Thus I agree with those that say changing the oil at 3,000 miles is a waste both in $$$ and oil... Todays oils/engines/fuels are NOT the same as Grandpappy's oils & engines/fuels... IMO
Last edited by 2021F350; Oct 23, 2025 at 03:36 PM.
Reason: spelling
I've personally seen 10Rxx and 10Rxxx transmissions go south under 70K-80K., and the general consensus was that the fluid should have been changed far more often than what Ford "recommends".
Beyond that, there's a significant difference between changing your trans fluid every ~35K miles and changing you oil every ~3K miles.
Significant as in a 12:1 ratio.
Math is important.
the 10Rxxx doesn't matter this is a 10R140. Not a 10R anything else. I don't care if a 10R80 locked up at 10k miles. That has zero effect on my 10R140. Also 30k or 35k miles IS a waste of money when ULV is $17+/quart.
I've personally seen 10Rxx and 10Rxxx transmissions go south under 70K-80K., and the general consensus was that the fluid should have been changed far more often than what Ford "recommends".
Beyond that, there's a significant difference between changing your trans fluid every ~35K miles and changing you oil every ~3K miles.
Significant as in a 12:1 ratio.
Math is important.
Well I personally have a 10R140 in my '21' with over 230,000 miles. Fluid changed at 148,000 miles. Change the oil/ filter 7,500-10,000 miles.
I'm comfortable enough with these intervals. Today's oils aren't your grandparents oils of yester year.
If someone wants to change their oils at far less intervals so be it. Whatever makes you comfortable.
Also 30k or 35k miles IS a waste of money when ULV is $17+/quart.
Agree changing at 35k is a waste, but you might want to shop around a little if paying $17/qt. This was my Rockauto order that was delivered today. This was for two 5qt jugs. $6.34/qt including shipping.
Agree changing at 35k is a waste, but you might want to shop around a little if paying $17/qt. This was my Rockauto order that was delivered today. This was for two 5qt jugs. $6.34/qt including shipping.
I looked about 2 years ago when I contemplated changing my fluid myself. I haven't thought about it since it was changed under warranty when my pump seal leaked. If the 10spd is gonna fail it's gonna fail. Draining the pan every 30k miles isn't going to prevent it because it isn't a fluid issue causing the majority of failures.
My goal for oil changes is 5k, but sometimes hit 7k if on a trip. If you do it yourself, the difference between changing at 5k vs 7.5k over 100k miles is only about $600; about 1/2 penny per mile; less with oil rebates. Not enough to sweat it.
Last edited by scottz99; Oct 25, 2025 at 02:06 PM.
10Rxxx refers to either the 10R100 or the 10R140. See how that works?
why would someone who owns a 10R140 care about parts failing in the 10R100 or vice versa? They arent even close to the same transmission. See how thay works?
My 2018 6.7 SRW is approaching 60,000 miles, I bought it with 15,000 miles on it. Always changed the oil and filter every 3000 miles, fuel filter every other oil change. When should I change out the other fluids?
I change my oil/filter every 5,500 - 6,500 miles, fuel filters every 20k miles, transfer case 60k miles, transmission every 80k miles, rear differential every 150k miles.
BTW... Fords 6 speed is about as reliable as an anvil.
Last edited by FishOnOne; Oct 25, 2025 at 08:19 PM.
For me it's oil ever 7500, fuel filters every 15000 and tranny/diffs/xfer every 30K-50K. Yes it might be a bit on the early side, but it makes keeping track of intervals easier. Unlike most owners, I keep my vehicles for a very long time and I've seen zero lubrication failures on my current vehicles with mileages of 355K, 301K, 298K, 220K and 203K. My 2019 Ford only has 85K, so it's the baby of the fleet.
Also, I don't get all of this cost savings non-sense. If it was all about cost savings, we'd all be driving a Prius or Toyota Corolla. I chose to order and drive a diesel King Ranch . Those two options added $14K to my sticker price. Some would say that was a complete waste of money, but I've never regretted it and the money spent on maintenance is cheap insurance toward a long life of the vehicle.
Lastly, if you think Ford wants your vehicle to last forever, that is utter non-sense. They are in the business of selling trucks and they want it have a decent life, but they want you to replace it with a new truck at some point in the future. There is planned obsolescence in the intervals recommended by Ford and I choose to ignore their recommendations.
I always find it funny that what one person does is never right for someone else, that being said we all know what opinions are like...... I often find myself servicing everything I own earlier than what the maufacturer recomends. I just call it peace of mind, wasting money? Maybe... but it definetly isnt going to hurt anything.
How many people buy the drink package on a cruise? waste of money?
But, when IS that...??? Almost certainly NOT at 3,000 Miles with todays oils, IF you use 100% synthetic high quality name brands... 
So far I have done 4 oil analysis tests for the last 4 oil changes, at 16,000Kms/10,000Miles each, (basically when the oil minder said 0 oil life left) and every one of them came back saying the oil was still good... 
For ALL my driving scenarios, I would consider them to be under the severe driving conditions banner...
