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Old 08-03-2011, 05:58 AM   #1
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conventional or synthetic... your thoughts?

i am just no reaching my first oil change in my new JEEP. the dealership gave me 4 free oil changes and tire rotations.

what do you use, conventional or synthetic, why?

my jeep is just hitting 2000 miles, what does the factory put in it?

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Old 08-03-2011, 06:21 AM   #2
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The factory use regular oil.I believe 10 w 30.
I just changed to synthetic at 45000 miles.there are alot
of different views on this.

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Old 08-03-2011, 07:37 AM   #3
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Read Bob The Oil Guy. Rather long, but informative if you are interested.

Most damage to an engine occurs at start up.
Dinosaur oil thickens overnight.
Synthetic oil does not.
Dinosaur oil thickens over time (with age....)
Synthetic oil does not.

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Old 08-03-2011, 07:50 AM   #4
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General consensus is, change often and no matter what oil you use-- you will be fine. Today's conventional oils are just at good as synthetics.
I like synthetic in the winter months, so i just stick with it
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Old 08-03-2011, 08:09 AM   #5
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awesome, thanks for the info guys. i have to make a decision by 4pm ET today for my first oil change.

thanks,
chadwick
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Old 08-03-2011, 08:24 AM   #6
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Quote:
Originally Posted by kjeeper10 View Post


General consensus is, change often and no matter what oil you use-- you will be fine. Today's conventional oils are just at good as synthetics.
I like synthetic in the winter months, so i just stick with it
It's my understanding (and that can most assuredly be incorrect) that conventional oils are *just as good as synthetics* (or close anyway) after the oil is warmed up. But, not at start-up.
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Old 08-03-2011, 08:26 AM   #7
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Quote:
Originally Posted by CG3

It's my understanding (and that can most assuredly be incorrect) that conventional oils are *just as good as synthetics* (or close anyway) after the oil is warmed up. But, not at start-up.
Agree
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Old 08-03-2011, 08:29 AM   #8
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Conventional oils are very good, synthetic oils shine in extreme conditions, offer better flow when cold, and can be used longer than conventional oil. If you change your oil and filter as per the OM odds are something else like body rot or an accident will be why you replace a vehicle, not oil related engine failures.
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Old 08-03-2011, 08:59 AM   #9
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I have used synthetics for a long time. I like the longer duration between oil changes. Also, as already stated, Synthetics thicken far less with a temp drop than mineral oils. The lower the temperature, the larger the disparity. Here in St. Louis we can have some pretty cold days in the winter, and enough of them that make Synthetic worth it to me.

Also, mineral oil has additives added to accomplish the different viscosities at starting vs operating temperature. When these wear out the oil gets to thin for your engine at operating temp. Synthetics do not have these additives to wear out. That's one of the reasons they last longer.

One last thing. A 10W-30 mineral oil is derived from a straight 10 oil. The additives make it a 30 oil at operating temp. A 10W-30 synthetic is a straight 30 weight oil. Meaning it can never be too thin at operating temp. And against all common sense is thinner at startup than an equivalent mineral oil.

Basically just get the synthetic, along with everything else you'll get better gas mileage.

Also, if going synthetic do a 0W startup viscosity. I think the wrangler manual recommends 5W-20 oil. I won't get into arguments about whether this is appropriate, but if following the manual, get a 0W-20 synthetic instead of the 5W-20.
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Old 08-03-2011, 09:05 AM   #10
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I just use whatever the dealership recommends. Whatever.

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Old 08-03-2011, 09:06 AM   #11
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So does someone want to explain to me why everyone thinks you can have "longer durations between oil changes" when running synthetic? Your oil gets dirty in the same amount of time...whether it be synthetic or conventional. This to me means that you need to change your oil at the same amount of miles no matter whether you are running full synthetic, synthetic blend, or conventional. Can someone enlighten me?
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Old 08-03-2011, 09:13 AM   #12
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I've got three words "piece of mind"
How long does it take to change the oil?
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Old 08-03-2011, 09:15 AM   #13
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[QUOTE=

Also, if going synthetic do a 0W startup viscosity. I think the wrangler manual recommends 5W-20 oil. I won't get into arguments about whether this is appropriate, but if following the manual, get a 0W-20 synthetic instead of the 5W-20.[/QUOTE]

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Old 08-03-2011, 09:28 AM   #14
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Quote:
Originally Posted by Cons_Table View Post
So does someone want to explain to me why everyone thinks you can have "longer durations between oil changes" when running synthetic? Your oil gets dirty in the same amount of time...whether it be synthetic or conventional. This to me means that you need to change your oil at the same amount of miles no matter whether you are running full synthetic, synthetic blend, or conventional. Can someone enlighten me?
The old standard is always every 3000 miles or 3 months. Whichever comes first. This is usually not because the oil has gotten "dirty". It has to do with how long the additives in the mineral oil last. A 10W-30 mineral oil is a 10 weight oil with additives to make it a 30 weight oil at 212 degrees F. Over time these additives are "consumed" and the oil thins out too much at operating temp to properly protect the engine. How long this takes will vary with driving style and use.

Synthetic oils do not have these additives. it is a 30w oil with properties that let it still be a thinner oil at cold or startup temperatures. Since it is always a 30w oil at operating temp you only have to worry about the thickening over time and use that affects all types of oil. This takes longer with synthetic as well.
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Old 08-03-2011, 09:31 AM   #15
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Quote:
Originally Posted by Cons_Table
So does someone want to explain to me why everyone thinks you can have "longer durations between oil changes" when running synthetic? Your oil gets dirty in the same amount of time...whether it be synthetic or conventional. This to me means that you need to change your oil at the same amount of miles no matter whether you are running full synthetic, synthetic blend, or conventional. Can someone enlighten me?
The need to change the isn't solely a function of how dirty it is. It has more to do with breakdown of the base lubricant and additive package. Once a conventional oil is exposed to hydrocarbons it begins to breakdown. This is not the case with a synthetic. Synthetic oils are able to maintain their ability to protect your engine longer because of this.

Using synthetics for the increased change interval is trivial to me. The real reason to use them is because they protect your engine better when it needs it most: startup and when working hard. Most drivers do both of those daily. If you don't believe that, look in your owner's manual and see how Chrysler defines normal and severe service. Chances are that none of us have ever owned or even seen a vehicle in normal service.

The reason "conventional" oils are so much better today is because most of them are not true conventional oils. Almost everything you get off the shelf these days is a synthetic blend whether they claim it on the label or not.
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Old 08-03-2011, 09:55 AM   #16
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I use synthetic in our "better" construction equipment but dino in the small engine stuff. I also use synthetic in the RV and the Jeeps. I don't beliueve in extended oil intervals so that's a moot point in my opinion. Dino oil does a good job under normal conditions. Where synthetic shines is in more extreme conditions.

It'll boil at a higher temperature so you won't get the carbon coking on the piston top and upper ring land that you will with dino. If the engine is working real hard or it's very hot (Moab in July with the A/C running) the synthetic will give you an extra layer of protection and will retain it's viscosity better at those higher temps. It'll also flow a whole lot better when it's in cold winter temps. The majority of your engine water is caused at startup and cold, thick oil doesn't help that any.

It costs more but then again, if it helps hold it together that much longer I feel it's worth it. If you plan on trading every 3-5 years it's probably not.

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