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Unread 06-30-2007, 09:00 AM   #1
robthebert
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Synthetic Oil VS Regular Oil

Is Synthetic oil any better than regular oil? I bought my Jeep about 6 months ans the origional owner used regular. My last oil change I used Synthetic, 97 XJ, 170k miles.

THe reason why I ask is because regular oil is cheaper. Can you go back to regular oil after using Sytnetic? Ive only used Sythetic once and its time for another oil change. Just wondering if it will hurt to go back. Thanks

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Unread 06-30-2007, 09:22 AM   #2
MGrobe
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In a nutshell. Synthetic is better than Dino Oil. Synthetic is more expensive. A switch to synthetic can give a slight increase in mileage. A well maintained vehicle can have a long life off of either type of oil. You can switch between either type without fear of something going wrong. Not all Synthetics are really 100% Synthetic so don't spend good money on a wannabe.

If you choose Dino over Synthetic chose a known good brand, IMO.

That should cover most.
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Unread 06-30-2007, 11:19 AM   #3
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Synthetic is better. They fall into two major classes for oils. Class III and Class IV. A Class II oil would be the typical 10w30 dino oil. Class III is the majority of of the shelf synthetics such as Pennzoil, Quaker State, etc and are highly refined mineral oils. Class IV synthetics are the Mobil 1, Amsoil, Royal Purple, etc and are built from the ground up as opposed to mineral oils that are put through another refining process.

Whether to use or not depends on what you want out of the oil. The Class II's are ok for the most part. Class III's are better.

Class IV's will off the best wear, heat, and cold start protection. They (due to molecular structure) will offer at least a little bit better fuel economy and smoother operation (of course the engine must be mechanically sound).

The synthetics will mix with mineral oils. They all will offer extending the oil changes past the 3000 interval. One can be very comfortable with 5000-7500 oil changes using a class IV synthetic and good filters (ie Wix/Napa Gold).

Due to cost, you will not get the most benefit out of a good synthetic if you want to continue to change at 3000 miles. It's your call, but changing oil that frequently is so old school. Oils have come a long way in the last couple of decades and virtually all of the oils will hold up well past 3000m. Why waste the money and oil. Of course, a no-name oil would not fall into this category. But the high quality oils out there will give you the ability to go beyond 3000m. The class IV synthetics will really give you the edge. OCI's beyond 7500 miles is not uncommon. The base oil and the additive packages in top line synthetics offer great protection for extended drains.

It comes down to this, if you want the best protection for all extremes, excellent cold start performance down into the -40F or lower range, easier year round starts, more effeciency, etc. then step up to the bar and go with good synthetics. I will never understand why people will have no problem plunking down a wad of money and usually getting a loan to finance a vehicle and insist on protecting that investment with the cheapest no-name oil and filters on the market. I have my biases on what brand is best, but that is not the point. Get a good quality synthetics and high quality filters (do the drive train components as well). You (and your vehicle) will never regret the choice.

Do they do the job? Well, 1.5 million (yes million) miles on my last semi. It NEVER had the engine gone into, it still got good fuel mileage, did not use oil excessively, and was still mechanically sound when it was sold. In fact, I see it occasionally and it is still working and it still hasn't had an overhaul. You get what you pay for applies when it comes to maintenance and oils.
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Unread 06-30-2007, 11:27 AM   #4
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www.Bobistheoilguy.com

All the answers are there.
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Unread 06-30-2007, 02:37 PM   #5
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Thanks, Bryson. Forgot to mention Bob. That is a real good site.
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Unread 06-30-2007, 05:06 PM   #6
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Just seen a tv ad for Mobil 1 15,000 mile extended wear syn. Seeing as though I only average about 10,000 miles a year is it really possible that I could go a year and a half on a single oil change? Also what about the filter, do they also make a 15,000 mile filter and if not can you change the filter at 7000 without draining the oil? I am not saying i am going to do this but, I am wondering.
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Unread 06-30-2007, 05:15 PM   #7
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Another question, I just turned 76,000 miles and I have always run the dino stuff. Should I go with the dino high mileage stuff or should I switch to a full syn?
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Unread 06-30-2007, 05:20 PM   #8
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there has been a lot of talk around here in the past couple of months about that same question that you just asked.

basacally from what i have read if you have been running dino then stick with it as many people have made the switch and it has caused there seals/gaskets to leak because of the dino wearing off. I would just stick to what is working with you, i have never put synthetic in my 4.0L and i dont intend to as my engine is running very nicely just the way it is.

-Kyle
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Unread 06-30-2007, 05:32 PM   #9
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from my research if you want to switch to syn its good to do a gradual change

i went from full dino to the part syn to the full syn and now i use mobil one or royal purple

love em both
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Unread 06-30-2007, 05:54 PM   #10
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I ran castrol synthetic and it ran hotter then the normal gtx so im back to gtx and lucas good stuff cant beat it idk what bob says its my vehicle i know what makes it run best.
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Unread 06-30-2007, 06:33 PM   #11
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The synthetic will cause leaks idea is a myth. Feel free to switch between the two and not worry about it. There is a possibility that it will reveal hidden leaks covered up by the dino oil but it is not the synthetics fault. Personally, I would rather find and fix a leak then have it covered up by sludge.

Run whatever you would like to. In my opinion, choice of oil filter is more important than choice of oil if it is changed regularly.
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Unread 06-30-2007, 06:53 PM   #12
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Quote:
Originally Posted by xjken99
Just seen a tv ad for Mobil 1 15,000 mile extended wear syn. Seeing as though I only average about 10,000 miles a year is it really possible that I could go a year and a half on a single oil change? Also what about the filter, do they also make a 15,000 mile filter and if not can you change the filter at 7000 without draining the oil? I am not saying i am going to do this but, I am wondering.

That is pretty much car/engine dependant. Many of the new cars have oil change intervals of 15-20k miles or once a year. I would not run any oil in any engine for more than a year no matter what it is. If you have a normal, old- tech engine like the 4.0 litre powerplant on our XJs, you can use dino in the engine on warm climate. That's if you want to do so. Cold climate, I'd say no.


I myself would NEVER use regular oil in cold climate, and as a matter of fact I would not use that crap in any kind of climate. With good- quality fully synthetic oil and good filter you can roughly double the 3000 mile oil change interval of the 4.0 without a problem. Just keep an eye on oil level (and how the oil looks like). Paying about 60-70$ per oil change every 5000-7000 mile doesn't sound too bad for me - if you can't afford that, how can you afford driving/ owning a vehicle..

Also, if you live in area where you have a real winter, I'd only run fully synthetic. I've seen the difference between fully synth. and regualr engine oils - having same cold/ warm viscosity ratings - there is in very/ extreme cold temps. Synthetic oil still remotely looks lke engine oil and can actually be pumped by the oil pump, where regualr oil looks more like candle wax. It simply cannot be pumped at cold temps!
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Unread 06-30-2007, 06:57 PM   #13
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I want to run synth now, extra mpg sounds tempting since gas is $3.09 here
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Unread 06-30-2007, 07:03 PM   #14
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Gas is around 1,35€/ litre here.. which is 6.77$ per gallon in your units. Gas is expensive in western Europe.


So yes, any extra mileage I can get does sounds tempting to me as well. Don't expect any miracles though, better oil doesn't really improve MPG that much. THe main difference is it works much better in extreme temps (cold or hot) and lasts longer in good condition.
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Unread 06-30-2007, 08:04 PM   #15
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I think synthetic oil is a waste of time and money. I dont trust any oil synthetic or dino and no matter what scientific tests have been done to go past 3000 miles. Cars have been running regular dino oil forever. Manufacturers still run dino oil in their cars. I just dont buy into spending the extra money and it will save the life of your engine. How many 4.0L engines have gone up to almost 300,000 miles on dino oil? Thats good enough for me!
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