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re: Anyone a motor oil geek?
Posted on 5/30/26 at 8:33 am to Wtodd
Posted on 5/30/26 at 8:33 am to Wtodd
I dont have any first hand knowledge about it. My customers all run whatever their contract supplier sells, usually shell stuff. Its all big diesel engines so not directly comparable to on highway passenger vehicles. I use whatever is on sale at wal mart that meets the specification I need.
What Ive seen is that with reputable name brand of the correct viscosity, nothing matters except change interval. The difference between engines that greatly exceed scheduled life to overhaul and one's that dont make it there seem to be oil change interval and air filter quality. Nobody has seen a verifiable difference in any brand. Since combustion contamination is the primary driver of change intervals in those applications, they dont even see a difference in conventional vs synthetic.
Hence why I am inherently skeptical of any kind of claims of something being much better than the normal off the shelf stuff.
What Ive seen is that with reputable name brand of the correct viscosity, nothing matters except change interval. The difference between engines that greatly exceed scheduled life to overhaul and one's that dont make it there seem to be oil change interval and air filter quality. Nobody has seen a verifiable difference in any brand. Since combustion contamination is the primary driver of change intervals in those applications, they dont even see a difference in conventional vs synthetic.
Hence why I am inherently skeptical of any kind of claims of something being much better than the normal off the shelf stuff.
2
Posted on 5/30/26 at 9:35 am to DownshiftAndFloorIt
I agree somewhat with your post. The most important thing is changing oil on time for sure. However not all oil that meets say gf7 are the same. They have different detergents and additive packages as well as different groups of base oils. To my knowledge there is 5 different base groups ranging from conventional to high performance specific applications. Some are pao some are pao/ester blends and etc.
When you see an oil that has an api gf7 seal that means it just meets the minimum standard required and some go above the minimum requirement
When you see an oil that has an api gf7 seal that means it just meets the minimum standard required and some go above the minimum requirement
Posted on 5/30/26 at 1:28 pm to DownshiftAndFloorIt
There's a YouTube channel called "Dave's Auto Center" that gets into a lot of light-duty diesel trucks. One customer had 900,000 mile truck come in that was still running the original fuel pump, basically its proper OCI's and filtration. Keeping things clean is the best way to get durability which pretty much applies to every system.
Posted on 5/30/26 at 1:45 pm to Lucky_Stryke
Ill hopefully get to watch that long video from the first page tonight.
Posted on 5/30/26 at 2:34 pm to DownshiftAndFloorIt
When you have time the one I posted that tested the oils is very very interesting!
Posted on 5/30/26 at 2:54 pm to Clames
I think its probably a little different with diesels than gas engines, but with the gas engines all becoming direct injected and turbocharged I imagine the differences are fewer. The diesels I deal with are almost all solid lifter low power density engines with giant oil pumps and in those engines, they pretty much just need some flavor of uncontaminated heavy duty oil to last a very long time.
Whats the primary driver for lube oil going out of spec in passenger vehicle gas engines?
Whats the primary driver for lube oil going out of spec in passenger vehicle gas engines?
Posted on 5/30/26 at 4:15 pm to DownshiftAndFloorIt
quote:
Whats the primary driver for lube oil going out of spec in passenger vehicle gas engines?
The fact that oil has to do more than just be slippery and transfer heat. It's expected to be a hydraulic fluid to actuate cam phasers as well as put up with more heat while working within increasingly tighter tolerances between parts that shear it down faster. Basically modern engine oils can't truly handle the recommended extended drain intervals under the service conditions they operate in. I did an oil change in my Rav4 the day before yesterday, the oil coming out looked like it could go another 5k miles, I have an oil filter cutter and the Mobil 1 filter I used for that interval looked like it had only been soaked in fresh oil, no carbon specks or anything. Toyota says 10k OCI's are doable but I don't think it worth it. Even having to order my oil and have it shipped is only marginally more expensive than buying a M1 variant. This is my fourth oil change with the same Idemitsu oil so I plan to send off the next 5k mile sample for testing.
Posted on 5/30/26 at 7:14 pm to Clames
quote:
Toyota says 10k OCI's are doable but I don't think it worth it
Is there a manufacturer out there that doesnt recommend 10k+ changes anymore? All my vehicles (jetta, dodge diesel, subaru) call for 10k miles or 1 year IIRC.
I agree, its not worth it, especially with a small sump. I do all mine when I think about it which is somewhere between 5k and 10k miles. The equipment all gets done once a year since it doesnt ever get used enough to hit the hour recommendation.
Even with the diesel that holds 3 gallons of oil, its still a $15 filter and $60 of oil. In the grand scheme of things its dirt cheap to change oil.
Posted on 5/30/26 at 7:25 pm to Clames
There’s no way I’d run a 10k mile intervals with any oil. Maybe amsoil out to 6-7k.
Posted on 6/6/26 at 10:12 pm to Lucky_Stryke
for those in the thread, allegedly there is supposed to be a price increase in motor oil coming. just fyi
Posted on 6/7/26 at 6:52 am to Lucky_Stryke
quote:
I watched some filter testing videos from a couple guys on YouTube and ford was the best oem. Toyota was one of the worst. Meaning particulate filtration. Now I’m not saying it’s the gospel but every video I’ve seen about Toyota filters results put it close to bottom. Carquest premium get solid reviews from everywhere I’ve seen. And it’s not been affected by covid manufacturing like some were. Fram is now out of business until someone new buys their rights and who knows what quality it will be
If fine particulate filtration is what you're after, you need bypass filtration.
Posted on 6/7/26 at 6:59 am to Lucky_Stryke
quote:
There’s no way I’d run a 10k mile intervals with any oil. Maybe amsoil out to 6-7k.
You need a UOA to verify the condition of your oil. If you are dumping a high end synthetic at 6-7K miles, you are wasting a perfectly fine oil that's engineered to protect for a much longer OCI. Then again, if it makes you sleep better, have at it.
Posted on 6/7/26 at 11:56 am to Lucky_Stryke
quote:
for those in the thread, allegedly there is supposed to be a price increase in motor oil coming. just fyi
Apparently we get most of pur Group III base stock from refineries in the ME, domestic production is building more capacity at least. I ordered a few extra jugs of Idemitsu a few weeks ago so I have oil changes for at least a year.
Posted on 6/7/26 at 12:35 pm to Clames
Yea I’ve got 4-5 oil changed for each of my vehicles to get me through the next 18 months or longer
Posted on 6/7/26 at 8:00 pm to Arkapigdiesel
quote:
You need a UOA to verify the condition of your oil.
thats a great plan if youre trying to extend oil changes once you have found the oil that keeps wear metals down to your goal
Posted on 6/8/26 at 11:38 am to Lucky_Stryke
I’ve put a total of 654, 000 miles, on 4 vehicles. On 3 of them, a total of 600,000.
The last 2 vehicles I change ever 10,000 miles. These two, full synthetic.
Never had a problem, motor wise.
Just a note, in my younger days I was a machinist, did work on motors, vehicles, boats and motorcycles.
Another note, Exxon bought out Mobil Oil for a number of reasons, but the biggest, Mobil One Oil.
The last 2 vehicles I change ever 10,000 miles. These two, full synthetic.
Never had a problem, motor wise.
Just a note, in my younger days I was a machinist, did work on motors, vehicles, boats and motorcycles.
Another note, Exxon bought out Mobil Oil for a number of reasons, but the biggest, Mobil One Oil.
Posted on 6/9/26 at 8:44 pm to LSUDad
Im not saying that you will have problems by changing oil at 10k intervals. im just saying statistically speaking that you are less likely to have oil related issues changing every 5k miles vs 10k miles..... especially with modern turbo engines
Posted on 6/9/26 at 10:30 pm to Lucky_Stryke
quote:
.. especially with modern turbo engines
This part I agree with.
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