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Old 03-30-2012, 11:19 AM   #1
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Switching from Dino Oil to Synthetic 10w-30

My TJ has a re-built 2.4L with 58,000 miles on the clock. The PO was using dino oil but I finally go around to changing the oil after purchase (I have only put 950 miles on it since purchase last year). I used the Wal-mart 10w-30 Supertech fully-synthetic to do the oil change last weekend. Wow - what a difference it seems to make! The engine runs so much smoother and has less of a 'growl' now than it did before the change.

I know some people might flame me for switching from dino to synthetic, but knock on wood, the engine is still young enough that it should be fine.

Just wanted to share this information with anyone contemplating using synthetic.

Someone else can speak to whether or not switching from dino to synthetic is a good idea for higher mileage vehicles.

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Old 03-30-2012, 11:22 AM   #2
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I switched at 150k on my diesel pickup and 120k on my 4.0

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Old 03-30-2012, 11:29 AM   #3
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nice! I will say though that the switch from Dino to synthetic is probably not the cause for your new smoothed out sounding engine. Its probably just that it needed an oil change and any fresh oil is going to improve how the engine sounds at first.
do you know what oil the PO was using? for all you know it was an incorrect weight or very old oil that was causing the engine to not sound as good.

either way its good to have an improvement! many might be surprised but supertech is supposedly a very good oil even though its walmart's brand. keep up the good work!
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Old 03-30-2012, 11:32 AM   #4
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You can switch back and forth between conventional and synthetic all you want at any mileage it doesnt make a difference. Dont believe all the rumors saying you cant or once you do you cant go back, its not true.
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Old 03-30-2012, 12:05 PM   #5
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You can switch back and forth between conventional and synthetic all you want at any mileage it doesnt make a difference. Dont believe all the rumors saying you cant or once you do you cant go back, its not true.
As an Amsoil dealer I do not recommend it, but it can be done, but you will defeet the sole reason that you switched to synthetic in the 1st place.

You should run a cleaner through a engine that is been run on Dino oil before switching to any synthetic on a engine with over 5K on the clock. A good cleaner is a quart of trans fluild, run the vehicle for about 300 - 500 miles and drain your oil while it is HOT.

In your case if you did not clean the engine before switching to synthetic I would change the oil at about 1500 - 2000 miles, the synthetic oil will act as a cleaner and if you do not know the oil change history from the PO it could cut all the crud lose in the engine and clog the oil filter, seen this happen many times.

I know nothing about Wally Worlds synthetic oil, is it pure synthetic or Dino based? If it is Dino based you might not have to do the short cycled oil change.

Anyhow that's my 0.02 worth.

BTW, the last time I change the oil in my 2000 Dodge Ram desiel was 248,000 miles ago, it has 3 synthetic oil filters on the truck that get changed every 25K, oil tests are done at that time and the oil is still within 98% of being brand new.
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Old 03-30-2012, 12:41 PM   #6
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A lot of great information here, thanks for the updates. To the previous poster who wrote that the Jeep probably needed a good old fashion oil change in the first place - you are probably right. The oil came out about a quart low so who knows how long it had been run.

I am not aware of the PO's fluid change schedules (no records came with the Jeep except proving the re-build of the engine by Jasper - the most important documents anyways!) so I am going about replacing all the fluids. Did the transmission and transfer case fluids back in January and the old fluid in both were pretty fresh.

@kwn306 that is a lot of good input you provided, thanks. I will likely do another oil change in 2000 miles as you say just to be safe.
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Old 03-30-2012, 01:32 PM   #7
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I know nothing about Wally Worlds synthetic oil, is it pure synthetic or Dino based? If it is Dino based you might not have to do the short cycled oil change.
Its a group III oil, so its not exactly "synthetic" but what does synthetic mean anyway? each oil group has its pros and cons and no oil will be made purely from 1 group. Oils will mainly consist of one type (amsoil being a PAO Grp IV i believe) but are then blended with different oils in the additive pack to gain certain behaviors from different groups.
anyway its been said that Group III oils almost perform just as good as group IV and V oils

as for mixing synthetic and conventional its safe, you can even make your own synthetic blend if you wanted to (popular with BITOG members since pre mixed synthetic blends don't use a high enough percentage of synthetics for the price in the minds of many, so they make their own with good UOA results)

all new oils meeting the new SN Spec are required to be compatible with each other, switching between different oils and mixing should never cause a problem.
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Old 03-30-2012, 03:26 PM   #8
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Originally Posted by kwn306

As an Amsoil dealer I do not recommend it, but it can be done, but you will defeet the sole reason that you switched to synthetic in the 1st place.

You should run a cleaner through a engine that is been run on Dino oil before switching to any synthetic on a engine with over 5K on the clock. A good cleaner is a quart of trans fluild, run the vehicle for about 300 - 500 miles and drain your oil while it is HOT.

In your case if you did not clean the engine before switching to synthetic I would change the oil at about 1500 - 2000 miles, the synthetic oil will act as a cleaner and if you do not know the oil change history from the PO it could cut all the crud lose in the engine and clog the oil filter, seen this happen many times.

I know nothing about Wally Worlds synthetic oil, is it pure synthetic or Dino based? If it is Dino based you might not have to do the short cycled oil change.

Anyhow that's my 0.02 worth.

BTW, the last time I change the oil in my 2000 Dodge Ram desiel was 248,000 miles ago, it has 3 synthetic oil filters on the truck that get changed every 25K, oil tests are done at that time and the oil is still within 98% of being brand new.
Wouldnt it be more cost/time effective just to change the oil every 5000-7500 miles instead of getting the oil tested each time?

Well actually you probably have to mortgage your house filling up a diesel with Amsoil every 5-7.5k so nevermind, it probably is more cost effective to test it

IMO high end expensive synthetics are wasted on a simple engine like a 4.0 unless you live in a very cold climate. They arnt foreign high end turbo engines and i think for 99% of jeep drivers regular 5-7.5k oil changes with regular oil and a good filter is all you need. There are plenty of 200,000-300,000 mile old 4.0's to prove it
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Old 03-30-2012, 05:34 PM   #9
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Sending oil to a indenpendant lab for testing is $15, the draw kit is about the same price.

Good synthetic oil is expensive, so your statement is true, 15 quarts to fill the beast with the 3 filters.

Depending on how one drives, city (stop & go) vs highway determines oil change intervals, you are also correct about the filter, it is the life blood of the system.

If one of my customers wants to purchase their own filter rather then purchasing one that I sell I recommend a Purolator PureOne (99% efficient), best damn filter you can purchase IMHO, unless you want to spend the big bucks for a EA Donaldson or Hamm (german) which are 100% efficient.

Back in the day (i'm dating myself now) we would put non-detergent oil in a engine when it was new to break in it, it was in there for about 1,000 miles. If you drove it like you stole it, the engine would last forever. Todays motors bearings, rings, etc are working in a tighter tolerances, the engines are running so lean because of the EPA that if you ran non-detergent oil in a car made today it probably would not last 1000 miles. Synthetics can get into those tight little areas, which reduces the heat build up and makes the motor run cooler and last longer.

These 4.0L motors are left over Rambler motors, they were workhorses in the 50's= 60's when Rommey's father was the owner of the company. Jeep purchased the rights when AMC went under and the rest is history.
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Old 03-30-2012, 06:23 PM   #10
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As an Amsoil dealer I do not recommend it...
Of course you don't!!! That would be like a McDonalds franchise owner recommending a Whopper.
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Old 03-30-2012, 09:20 PM   #11
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Originally Posted by kwn306 View Post
As an Amsoil dealer I do not recommend it, but it can be done, but you will defeet the sole reason that you switched to synthetic in the 1st place.

You should run a cleaner through a engine that is been run on Dino oil before switching to any synthetic on a engine with over 5K on the clock. A good cleaner is a quart of trans fluild, run the vehicle for about 300 - 500 miles and drain your oil while it is HOT.

In your case if you did not clean the engine before switching to synthetic I would change the oil at about 1500 - 2000 miles, the synthetic oil will act as a cleaner and if you do not know the oil change history from the PO it could cut all the crud lose in the engine and clog the oil filter, seen this happen many times.




I know nothing about Wally Worlds synthetic oil, is it pure synthetic or Dino based? If it is Dino based you might not have to do the short cycled oil change.

Anyhow that's my 0.02 worth.

BTW, the last time I change the oil in my 2000 Dodge Ram desiel was 248,000 miles ago, it has 3 synthetic oil filters on the truck that get changed every 25K, oil tests are done at that time and the oil is still within 98% of being brand new.
What??????
Sorry but I disagree with this.
If you need to do that with Amsoil.... don't waste your $$$$ on that overpriced boutique oil.

Pennzoil Ultra which cleans engines better than any other oil period, doesn't say you need a cleaner and it is a lot less expensive than Amsoil. Yes synthetics have a better detergent package. This is why you can get increased oil change intervals. The detergent holds the combustion by products in suspension longer. Yes the detergents clean the engine better which is why sometimes an engine leaks more after a change to synthetics.

I have NEVER heard anyone other than a stealership try and sell an engine flush between conversion form dino to synthetic.

If I was worried about sludge, I would not be using transmission oil to clean an engine, but a purpose built product like SeaFoam or if you want to spend $ BK44.

There are three reasons to run synthetics not a sole reason.
i) better cold flow properties
ii) better high heat protection
iii) extended oil drains

Otherwise it is just personal preference.

Buying engine oil is simple.
What do I own? ( the manufacturer tells you the API classification and the SAE weight and any other specification requirements )
Where do I drive my car? ( is it considered severe service)
What Brand do I know and trust.

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