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Old 09-19-2011, 09:47 AM
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Synthetic vs. Regular Oil

I been doing a little reading here on the forum and I've found that any time that oil is mentioned, synthetic is usually the top choice. So what makes one better than the other for our Jeeps?

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Old 09-19-2011, 09:58 AM   #2
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Short version. One you change sooner and costs less per change, the other you change less often and costs more. Flip a coin.

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Old 09-19-2011, 10:04 AM   #3
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Synthetic is just plain better, in pretty much every automotive application.

If you want the scientific explanation, I can give it to you:
The molecules in synthetic oil are much more uniform in size and shape, making synthetic oil much more resistant to breaking down in extreme temperatures. Synthetic also has a greater shear strength, meaning is doesn't break down as easily as conventional oil does when pressure and shearing forces are applied to it.
Synthetic oil is also chemically produced, so there is virtually NO contaminants, unlike conventional that will contain trace amounts of sulfur, wax, and asphaltic material. Because of synthetic oil's superior flow characteristics, you can also free up a few horsepower at the same viscosity level as conventional oil since resistance on the crank and in the oil pump is lowered (same for synthetic trans fluid and gear oil).

Do you NEED Synthetic? No, you can have a perfectly happy, long lasting engine with conventional motor oil. But, synthetic oil has been scientifically proven to be better at everything motor oil is designed to do, and that's worth the extra money to me. I run synthetic in everything I own.
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Old 09-19-2011, 10:29 AM   #4
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Quote:
Originally Posted by Mr. Sinister View Post
Synthetic is just plain better, in pretty much every automotive application.

If you want the scientific explanation, I can give it to you:
The molecules in synthetic oil are much more uniform in size and shape, making synthetic oil much more resistant to breaking down in extreme temperatures. Synthetic also has a greater shear strength, meaning is doesn't break down as easily as conventional oil does when pressure and shearing forces are applied to it.
Synthetic oil is also chemically produced, so there is virtually NO contaminants, unlike conventional that will contain trace amounts of sulfur, wax, and asphaltic material. Because of synthetic oil's superior flow characteristics, you can also free up a few horsepower at the same viscosity level as conventional oil since resistance on the crank and in the oil pump is lowered (same for synthetic trans fluid and gear oil).

Do you NEED Synthetic? No, you can have a perfectly happy, long lasting engine with conventional motor oil. But, synthetic oil has been scientifically proven to be better at everything motor oil is designed to do, and that's worth the extra money to me. I run synthetic in everything I own.
He's pretty much nailed it. I'd like to add:
Most of *normal* engine wear (read: damage) occurs at start-up. Dino oil thickens overnight. Synthetic does not. So - which one do you want coating those parts at start-up?
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Old 09-19-2011, 10:46 AM   #5
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I was looking at case-price in CostCo yesterday. Here a case of Mobil 1 synthetic was $33.74, while a case of the several standard brand oils was $34.99 all in 5W20.

Difference was.....the first was "SIX in a case" while the second was "TWELVE in a case".

I've never gotten around to trying the synthetics yet.
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Old 09-19-2011, 11:26 AM   #7
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I like mobil 1. I heard something interesting from a guy that worked on a pit crew for a lotus race team. He said you could buy a new vehicle, drain the oil and put in mobil 1 then never change the oil again. About a year later I saw the mobil 1 ad on TV where they took a volvo or something and put over 500k miles on the same oil.


I also heard synthetic can hold more particles in suspension than standard oil, which is why intervals can be longer between changes. I figure I save enough money doing my own changes that I can splurge on the good oil.
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Old 09-19-2011, 11:45 AM   #8
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Heh Heh, I'm not sure if all the other gear/axle mfgs have this policy, but

Yukon axle/gear specifically advises SYNTHETIC oil for their NEW GEAR BREAKIN/EXTENDED USE--or-----

---------NO WARRANTY----

So I use Valvoline 75w-140-

Furtherless--they know that the initial Gear breakin temps can exceed 350 F without breaking down the synthetic, course, they don't advocate temps like that to continue after initial use-but they have faith in the top synthetics ability to handle the high temps---without breaking down

Just thought you'd wanna know-

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Old 09-19-2011, 11:56 AM   #9
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Quote:
Originally Posted by Motorbreath View Post
I like mobil 1. I heard something interesting from a guy that worked on a pit crew for a lotus race team. He said you could buy a new vehicle, drain the oil and put in mobil 1 then never change the oil again. About a year later I saw the mobil 1 ad on TV where they took a volvo or something and put over 500k miles on the same oil.


I also heard synthetic can hold more particles in suspension than standard oil, which is why intervals can be longer between changes. I figure I save enough money doing my own changes that I can splurge on the good oil.

I wouldn't recommend it. The short version as to why: Additives get used up and depleted, contaminants need to be removed, which is why we change oil and filters. Now with a top of the line filtration system we can extend the intervals, but eventually the add pack will be spent, long before 500,000 miles.
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Old 09-19-2011, 12:29 PM   #10
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Quote:
Originally Posted by Motorbreath View Post
I like mobil 1. I heard something interesting from a guy that worked on a pit crew for a lotus race team. He said you could buy a new vehicle, drain the oil and put in mobil 1 then never change the oil again. About a year later I saw the mobil 1 ad on TV where they took a volvo or something and put over 500k miles on the same oil.
I don't believe half a million miles on the same oil for a second. Link?

Several years ago there was an independent test done on Mobil 1 in normal driving using oil analysis. The oil was finished by 18,000 miles in normal driving. The test was done in a manner that slightly favored the oil because every 1000 miles they drained a sample for analysis and topped it off with fresh oil. The also changed the filter once during the test. It took them about 10 months to run the test, then they followed it up with an Amsoil test that had basically the same result. The difference was that they got less mileage on the Amsoil, but it took over a year to get there. They did a pretty good job of approximating the difference made by topping off the oil and found that if they never touched it they could get about 10k miles out of it.

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Originally Posted by demarpaint View Post
I wouldn't recommend it. The short version as to why: Additives get used up and depleted, contaminants need to be removed, which is why we change oil and filters. Now with a top of the line filtration system we can extend the intervals, but eventually the add pack will be spent, long before 500,000 miles.
Exactly. Once oil is run in an engine it begins to degrade whether the engine is running or not. This is why the manual says to change it every 6 months regardless of mileage. Any test done that puts a lot of miles on an engine and its oil in a short amount of time is a highly biased test.
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Old 09-19-2011, 03:06 PM   #11
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I improved my mpg by 1-1.5 with synthetic being the only change.
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Old 09-19-2011, 03:17 PM   #12
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Guys, are we talking about Synthetic Blend or 100% Synthetic (I have always used Synthetic blend in all my Vehicles).
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Old 09-19-2011, 03:22 PM   #13
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100 percent, a blend is about a third synthetic.
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Old 09-19-2011, 03:29 PM   #14
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My tj has about 100,000 miles can I start using synthetic? I was once told that you can't use it after 50 grand or so or it will leak .
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Old 09-19-2011, 03:48 PM   #15
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Quote:
Originally Posted by Xgrunt
My tj has about 100,000 miles can I start using synthetic? I was once told that you can't use it after 50 grand or so or it will leak .
I heard that when using conventional oil for that long gunk will build up in certain areas creating "false seals" in gaskets. Then when you add synthetic it will clean away that gunk and the "false seal" causing the gaskets to leak oil.
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Old 09-19-2011, 03:49 PM   #16
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My tj has about 100,000 miles can I start using synthetic? I was once told that you can't use it after 50 grand or so or it will leak .
It won't hurt anything, but it can uncover some issues that conventional oil was covering up. If there is any sludge inside from the conventional that is sealing a gasket, the synthetic may remove the sludge and cause the gasket to start leaking. Is this because of the synthetic? Not really, but it's been blamed for causing leaks before.
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Old 09-19-2011, 04:14 PM   #17
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i bought a blazer with 200000 miles on her. the guy said all he used was regular oil. i put synthetic blind in it now every oil change and have sence iv owned it. it now has 240000 never had any problems
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Old 09-19-2011, 04:46 PM   #18
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Ok thanks guys, I am gonna try it. Worse case is a weekend wrenching to replace seals(: I run synthetic in my 06 suburban and my 03 Mach 1 just wasn't sure about switching the jeep. Thanks again
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Old 09-19-2011, 04:49 PM   #19
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If your TJ, has over 100k miles onit--


Quote:
Originally Posted by Xgrunt View Post
Ok thanks guys, I am gonna try it. Worse case is a weekend wrenching to replace seals(: I run synthetic in my 06 suburban and my 03 Mach 1 just wasn't sure about switching the jeep. Thanks again
Pray tell, why do you wanna switch to syn. now-

Do you fix your roof, if it doesnt leak ??

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Old 09-19-2011, 05:02 PM   #20
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Just bought it last month. Would like to keep it simple in my shop and just have two brands and not three different oils.
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Old 09-19-2011, 05:06 PM   #21
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Just bought it last month. Would like to keep it simple in my shop and just have two brands and not three different oils.
Now I have no idea what you're talking about, but

Not to worry-I'm gettin outta town

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Old 09-19-2011, 05:09 PM   #22
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I typically use synthetic oil in my new loved rigs, as they age and get to beater status I switch to cheaper dino oil. I bought my Aerostar used with 53K miles on it, and used dino oil exclusively, I currently have 202,000 miles on it. The engine runs great, my problem is pot holes and rust got the best of her. My oil pan rotted from the outside in, I fastened lead flashing over it, and completely stopped the leak, LOL. If I ran an engine 100K miles on dino I'd stick with dino oil. JMO
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Old 09-19-2011, 05:12 PM   #23
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My dads car is not maintained by any standard. 2000 mercury grand Marquis. Police interceptor. We used it as a fleet vehicle for 6 years over-the-road. 200k miles. No major engine work. I replaced a battery in it last week (only thing ever went wrong) and it has ran mobil one it's whole life.



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Old 09-19-2011, 05:29 PM   #24
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I use Mobil 1 syntethic extra mileage on all my vehicles mainly because i do my own oil change and its every 10k miles.With conventional its every 3k.
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Old 09-19-2011, 05:34 PM   #25
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I change the oil in my Aerostar every 5,000 miles using dino oil. My liberty sees synthetic oil changed every 6 months to keep the warranty people happy. I change synthetic oil in my E-150 every 9-12 months depending on how its used. Most cars usually die from something other than oil related problems
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Old 09-19-2011, 05:40 PM   #26
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Everybody has a story, them-self or somebody's brothers uncle who used....

Do we ever really hear about failures do to
choice of oils?..... Nope... That's what I thought.

Change your oil/filter often.... Thats it...
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Old 09-19-2011, 06:06 PM   #27
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Quote:
Originally Posted by Mr. Sinister
Synthetic is just plain better, in pretty much every automotive application.

If you want the scientific explanation, I can give it to you:
The molecules in synthetic oil are much more uniform in size and shape, making synthetic oil much more resistant to breaking down in extreme temperatures. Synthetic also has a greater shear strength, meaning is doesn't break down as easily as conventional oil does when pressure and shearing forces are applied to it.
Synthetic oil is also chemically produced, so there is virtually NO contaminants, unlike conventional that will contain trace amounts of sulfur, wax, and asphaltic material. Because of synthetic oil's superior flow characteristics, you can also free up a few horsepower at the same viscosity level as conventional oil since resistance on the crank and in the oil pump is lowered (same for synthetic trans fluid and gear oil).

Do you NEED Synthetic? No, you can have a perfectly happy, long lasting engine with conventional motor oil. But, synthetic oil has been scientifically proven to be better at everything motor oil is designed to do, and that's worth the extra money to me. I run synthetic in everything I own.
HUGE waste of money.
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Old 09-19-2011, 06:54 PM   #28
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HUGE waste of money.
If you say so, boss. Care to elaborate?
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Old 09-19-2011, 07:07 PM   #29
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Good advise-


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HUGE waste of money.
Where were you when I Wasted all my money on :

1)-JEEP
2)-TREADLIGHTLY
3)-CCW
4)-VALVOLINE DIFF SYN
5)-OIL PAN SKID (WHY PROTECTIT, YOU GOTTA PUT NEW SYN. INIT ANYWAY
6)-COBRA CB (NOBODY USESEM ANYMORE

Man, I've been wasting money for DECADES

smokemifyougotem

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Old 09-19-2011, 07:10 PM   #30
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I think I'd rather change my oil and filter more often than waiting longer with more expensive oil. But whatever you're comfortable with I guess. I don't usually check my oil levels as often as I should, so changing my oil more often kinda
makes up for it I guess lol.

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