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Old 01-16-2017, 04:29 PM
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4.0 engine oil change intervals

I've been putting regular dino oil in my jeep and changing it every 3000, 10w 30. I have 142,000 on it and it doesn't burn any oil.

Any one hear put conventional oil in and change it every 4000? Or is that pushing it?

thanks,
Joe

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Old 01-16-2017, 04:47 PM   #2
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You could send in an oil sample to have it tested. Not only will they tell you how much life is actually left in your oil at a 3000 mile OCI, but it give you a heads up if anything inside your engine is wearing abnormally.
I use these guys Blackstone Labs
It's quite interesting on how much information is gathered when testing your oil.

If your 3k mile oil has some life left to it they will suggest you lengthen the OCI (oil change interval) and retest next oil change.

For example I was running my Powerstroke on a 5000 mile OCI on synthetic oil, lab results came back suggesting that I extend the OCI. I am currently up to an 11,000 mile OCI. But I do change the filter and add two quarts at the half life.

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Old 01-16-2017, 04:59 PM   #3
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^^ +1 On Blackstone Labs. Send them an sample and make sure to have them check the TBN on the report. That will tell you have much life is left in the oil, and eliminate any guess work involved in how long the oil can be run.

As mentioned the report will also red flag any problems as far as abnormal wear, fuel dilution, how well the air filter is working, and if coolant is mixing with the oil.

If you decide to go that route post the results.
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Old 01-16-2017, 05:05 PM   #4
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Originally Posted by Hazlitt777 View Post

Any one hear put conventional oil in and change it every 4000? Or is that pushing it?
The manufacturer actually recommends 6000 mile oil changes provided that certain driving conditions are not encountered.

Here is a list of the items that must be avoided:

• Day or night temperatures are below 0°C (32°F)
• Stop and go driving
• Excessive engine idling
• Driving in dusty conditions
• Short trips of less than 16.2 km (10 miles)
• More than 50% of your driving is at sustained high speeds during hot weather, above 32°C (90°F)
• Trailer towing
• Taxi, police, or delivery service (commercial service)
• Off-road or desert driving
• If equipped for and operated with E-85 (ethanol) fuel.
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Old 01-16-2017, 05:23 PM   #5
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My 4.0L has 206,000 miles and I just started using Rotella T5 10w 30 and change my oil every 3-5,000 miles. This recent oil change I went to 6,000 just because of time constraints and the temperature being a bit chilly to get the motivation to crawl under my rig. Overall I didn't notice any issues though. I'll always change my oil every 3,000 miles though because of how many miles are on my motor and the climate I live in.

I'll definitely have to check out Blackstone Labs though!

-Jake
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Old 01-16-2017, 05:48 PM   #6
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Every 5k is more than sufficient.
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Old 01-16-2017, 08:22 PM   #7
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Every 5k is more than sufficient.
I have to agree. When I was a kid, (1970s), the standard was 5,000 miles. While under warranty, the dealer used to do it for free, and that was the recommendation from them.
Then these "oil change" places started springing up, and it somehow got down to 3,000 miles. I wonder why.
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Old 01-16-2017, 09:21 PM
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Thanks guys. I should do the labs for the fun of it sometime. I bought this rig when it had 115.000 miles on it. So it might be smart to check to get a sense of how strong the engine is yet.

It doesn't seem to burn any oil yet which is great. So maybe I will go 4000 and that should still be safe. I don't think I drive it that hard or cold.

t
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Old 01-16-2017, 09:25 PM   #9
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I have to agree. When I was a kid, (1970s), the standard was 5,000 miles. While under warranty, the dealer used to do it for free, and that was the recommendation from them.
Then these "oil change" places started springing up, and it somehow got down to 3,000 miles. I wonder why.
It was just a money grab. Newer vehicles have 6-10k factory intervals. Synthetics have been lab tested to still be good at 20K.
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Old 01-17-2017, 07:11 PM   #10
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My 4.0 has about 220,000 miles and I change the oil once a year which used to be about 10,000-15,000 miles when I drove more. Always used Amsoil 10w30 synthetic. The engine is solid and burns less oil than my much newer JKU.
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Old 01-19-2017, 09:14 PM   #11
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I have to agree. When I was a kid, (1970s), the standard was 5,000 miles. While under warranty, the dealer used to do it for free, and that was the recommendation from them.
Then these "oil change" places started springing up, and it somehow got down to 3,000 miles. I wonder why.
I think I was a kid earlier than you were. I remember the 70s cars, many of which were really crappy, needing oil changes sooner than that. Plenty of mechanics and weekend mechanics recommended changing oil every 2000. Looking back, maybe they were full of crap, but those 70s engine didn't last as long as these engines do.

My highest mileage vehicle was my 93 GMC pickup with the 4.3L six. I changed the oil every 5,000 miles with dino oil. I drove it 200,000 miles and sold it with 333,000 miles on it. It was getting tired, but would still go 2000 miles before needing a quart of oil.

I've driven many other vehicles over 200,000 miles using the same oil change interval and so far after 35 years of owning vehicles, the only vehicle I have ever had to change an engine in was my current vehicle, a Jeep.
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Old 01-19-2017, 09:31 PM   #12
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I schedule for 4, but typically change between 4-5, sometimes over 5. 222k on the clock.

Never done it, but I'd be curious to send off a sample.
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Old 01-19-2017, 11:36 PM   #13
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I think I was a kid earlier than you were. I remember the 70s cars, many of which were really crappy, needing oil changes sooner than that. Plenty of mechanics and weekend mechanics recommended changing oil every 2000. Looking back, maybe they were full of crap, but those 70s engine didn't last as long as these engines do.
Nope. The vehicle I had the dealer change the oil on was a brand new 1975 CJ-5, with the AMC 304 V8. It WAS only a one year, 10,000 mile warranty, though.
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Old 01-20-2017, 09:52 AM   #14
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when I was a kid, our cars and trucks changed their own oil, we just needed to keep the level up.
The wife's fusion's owners manual recommends oil changes at 7500 mi. She takes it to a local oil change and they always put a sticker that wants her to come back in 3000mi. she just tells them to change it and do 7500. its a money thing.
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Old 01-20-2017, 02:08 PM   #15
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With the newer engine oil blends and refining processes, I don't change mine less than 3 yrs., or 6k miles.
The 3yr time interval is due to variations in ambient temperatures, how ever the mileage, is self explanatory.
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Old 01-20-2017, 02:17 PM   #16
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Nope. The vehicle I had the dealer change the oil on was a brand new 1975 CJ-5, with the AMC 304 V8. It WAS only a one year, 10,000 mile warranty, though.
The engines of the 1960's to early 1970's were high compression engines. They were used in so-called "Muscle Cars," and though they didn't have as long a life span as the engines of today, I could rebuild a GM 396ci 365HP, totally in a weekend, and drive to work Monday morning.
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Old 01-22-2017, 09:22 AM   #17
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I always push my synthetics cars to 5000 or 600 miles. But they newer and run some real tight tolerances. I just still to 3000 for my 4.0
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Old 01-24-2017, 09:41 AM   #18
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Every 5k is more than sufficient.
I do this on all of my vehicles. It's earlier than the OEM recomends and is easier to just look at the odometer and know when it's due. Check oil level frequently.
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Old 01-30-2017, 11:15 AM   #19
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I change mine every 5000 miles,
I used straight 30w until the government removed ZDDP, I switched to Rotella 15/40wt.
At 175,000 miles I switched to 20w/50 Castrol Racing due to a noisy lifter.
I changed the engine out at 320,000 due to a broken piston, the used replacement engine had 120,000 and I have continued with 20w/50 Castrol Racing
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Old 01-30-2017, 11:18 AM   #20
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Every 4 to 6 months for mine. Intervals range from 3k miles to 8k miles but works fine for me

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