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Old 03-20-2009, 10:52 PM   #1
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jk OIL mineral or synthetic????

hi its been my third oil change in my jk and in the owners manual it says its 5w20 but in my country ive only find 10w30 some people are telling me that it might damage my engine on time to time....and i finally found it but its motorcraft synthetic oil 5w20.
the question can i change from mineral to sythetic??? how should i just change it or do i have to do somthing else or is it bad to do that???
thanks
Stefano Taboada

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Old 03-21-2009, 01:42 PM   #2
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Ok. Starting from the top: running thicker oil will make starting harder, hurt gas mileage, power, and may eventually hurt the engine. Run 5w20, no thicker than 5w30 if you HAVE TO.
What country? Looks warmer than here! (Upstate NY- was 16 degrees Farenheit this morning!)
Next, Motorcraft is a sythetic BLEND, meaning part synthetic, part dinosaur oil. It's alright, and may be a slight improvement in power/MPG.
As for switching, don't do it too often. Your best bet would be to go to the dealership where you bought the car or any other dealer and find one that stocks 5w20. If you can find synthetic, Mobil 1 is the best. If not, any 5w20 should be fine- Mark W.

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Old 03-21-2009, 06:27 PM   #3
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how often do you change oil? Modern high quality dino oil, except in extreme temperatures or sever racing conditions, protects an engine as well as synthetic, just not for as long. So if you change the oil at factory recommended intervals, unless you are in the summer desert or sub-zero temps, don't waste you money on synthetic.

That being said, I run synthetic and extend my oil change intervals. I usually go 1.5 times the recommended interval on my motorcycles, and 2 times on my cars. But I also keep track of how they are running, if the shifting gets notchy on my bikes I change early, and if the cars seem sluggish or the gas mileage drops, I change early.

Also, over the last 5 years or so, dino and synthetic have become much more compatible and vehicles are using much better seals so changing back and forth is not really an issue. And actually changing brands regularly can be beneficial as each brand uses a different detergent mix and while detergents clean the engine, they also can build up upon themselves in the engine. When you change brands the new detergent mix will clean out the old build up before it starts to build on itself.

And finally, many synthetic blends are only 10% synth, and the rest are at the most 30%, so not really worth the extra you pay. If do normal interval changes but you want to run a blend to have a little better protection in the case of extremes, use a dino and synthetic of the same brand and same weight and run one or two quarts synth and the rest dino.
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Old 03-23-2009, 01:59 PM   #4
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I think there is a bit of an over-sensitivity on the oil thing. Unless you are in really cold temps, I wouldn't worry about using 10W30 - especially synthetic since it seems to be a little on the thinner side anyway. Heck, people run 25W50 in cars that they bring to the race track even when the manual says 5W30. I just wouldn't do that in cold weather.
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Old 03-24-2009, 08:57 PM   #5
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Question Follow up question

Along the same lines I just bought a new 2009 Wrangler X that will be driven less than 500 miles per month usually on pretty short trips because my office is 1 mile from the house. I live in KC so I get cold weather and extremely hot summers. My old car I changed the dino oil every 4 months even though it wasn't due based on mileage or the oil sensor (which I didn't trust anyway). Any thoughts if I am better off going synthetic and every 6 months regardless of mileage or dino and every 4. I plan on keeping the Wrangler for a very long time...
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Old 03-24-2009, 09:30 PM   #6
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Quote:
Originally Posted by bchapin3 View Post
Along the same lines I just bought a new 2009 Wrangler X that will be driven less than 500 miles per month usually on pretty short trips because my office is 1 mile from the house. I live in KC so I get cold weather and extremely hot summers. My old car I changed the dino oil every 4 months even though it wasn't due based on mileage or the oil sensor (which I didn't trust anyway). Any thoughts if I am better off going synthetic and every 6 months regardless of mileage or dino and every 4. I plan on keeping the Wrangler for a very long time...
I have not researched this particular situation, but I would say, yes use synth, And you might go ahead and have the oil tested after 6 months, it might still be fine.
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Old 03-30-2009, 10:30 AM   #7
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Going by how I see palm trees in the avatar picture, he WOULD benefit from having the added thermal protection of synthetic. People in cold climates also benefit from the lower pour point of synthetic (it will move more easily in cold temperatures). Also, the added fuel economy and reduced engine wear are solid benefits. Availability should not be an issue- many parts and fluid warehouses will ship internationally; just plan ahead and you should be fine! Mark W.
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Old 03-31-2009, 08:10 AM   #8
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If it was supposed to have synthetic oil in it the manufacture would have put it in when it was built. Use exactly what the manual calls for, you can't go wrong with that.

Not sure if you have Walmarts where you live but if so try them. Here in the states the Walmarts carries the 5w-20 regular oil in their stores.
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Old 03-31-2009, 08:52 AM   #9
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What country are you in, Tento?
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Old 03-31-2009, 09:06 AM   #10
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Actually, hitchhiker, they would, but there's the cost issue- people buying a $19k car usually don't want to spend $100 on every oil change. Also, since it's an engine used in vehicles in the third world, they don't use synthetic because it may not be available in those countries. NOT because the engine can't or shouldn't run it. There's no engine out there that won't benefit from a deep swig o'the good stuff- Mark W.
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Old 03-31-2009, 05:46 PM   #11
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Duke, I pretty much agree with your last post. But the one before that, just because you see palm trees you think he lives where is gets extremely hot? This is Florida not the Arizona desert. Very few places here does it get that hot or hot for very long. Has something to do with no place being more the 50 miles from a large body of water, and no more than 80 mile from the ocean.
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Old 03-31-2009, 05:50 PM   #12
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I don't think he's in FL, man Anyway, even in FL, or NC for that matter, it gets over 90 degrees Fahrenheit more than once in a while. I didn't say extremely hot, and he mentioned "his country."
Over 90 degrees F, 5W20 mineral oil is pushing its limits in terms of thermal breakdown in a hot engine. At that point, the synthetic would be a solid bet.
Relax, amigo Mark W.
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Old 04-01-2009, 10:06 AM   #13
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Over 90 degrees F, 5W20 mineral oil is pushing its limits in terms of thermal breakdown in a hot engine. At that point, the synthetic would be a solid bet.
Relax, amigo Mark W.
Ummmm, my JK has a pressurized fluid-cooled system that maintains nominal engine operating temperatures regardless of outdoor ambient... ...pretty much always the same temperature in there whether it's 130 outside or -15...
...is your JK air-cooled, perhaps?
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Old 04-01-2009, 10:51 AM   #14
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If your oil temps stay the same from -15 to 130 above, you have the most amazing lubrication system ever built. I'm sure every engine builder, myself included, and OEM would want to study it.
Listen- I've been building engines professionally for the past seven years, including working for Roush Racing in NC. I understand a thing or two about fluid dynamics, thermal issues, and lubrication.
I'm not saying that his engine is cooking his oil because he's near palm trees. I'm simply saying that any engine will benefit from synthetic oil, especially in hotter or colder climates. Even with a thermostatically controlled oil cooler (if he added one), running cooler when it's hot out is never a bad thing.
Just because my post count is low doesn't mean I don't know what I'm talking about, folks. I may not know Jeeps inside and out, but I know engines better than most folks. Where's the love? I hate having to be defensive. I know you don't know me, but that gives you no right to rip on me, especially when what I'm saying is sound.
Cheers Mark W.
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Old 04-01-2009, 01:41 PM   #15
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It's cool; don't get defensive. I've never built an engine.
But I'm the senior admin at a gas chromatography/mass spectrometer training lab --- where we train the technicians from the various petro-chemical industries to make their devil's brews.
And I agree with you; molecular science is a friend to us and I run synthetic oil myself. But some of these boys whip up a dandy blend of dino-juice too and Tento can probably do just fine with it.
After all, it's just a low compression Jeep engine.
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Old 04-01-2009, 01:45 PM   #16
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Sorry- rough day at work And it's hard to read tone through a computer screen- not to mention the boss just told us we're not ordering any new cars until Chrysler falls on one side of the fence- I have THIRTEEN new Jeeps in stock right now! It's pathetic. Sigh...
Anyways, it's true he doesn't NEED synthetic, I was just saying, it would do him no ill- Mark W.
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Old 09-14-2011, 08:15 AM   #17
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I can't believe the ignorance about synthetic oil!

Some very basic rules when it comes to synthetic oil advice from people. If someone tells you you cat use synthetic because it's not compatible with your motor, or it can't be mixed with regular oil, you need a special flush to remove your old oil, your engine cannot be broken in with synthetic, or you need to break in your motor first and then switch to synthetic, the synthetic is not compatible with your seals etc. You must ignore that persons advise and realize they are ignorant and know absolutely nothing about synthetic. Synthetic can be mixed with reg oil, oil companies sell synthetic blends! But mixing large amounts on your motor will just dilute synthetics purpose . Also if the 2 oils are not compatable then it's not compatable with the engine flush either! All new German cars as well as Corvettes and vipers and almost every high dollar sports car comes filled from the factory with synthetic. I can go on and on but don't take my word just go to any synthetic oil producers web site and they will tell you the same thing. This isn't rocket science just common sense. And also not one vehicle manufacturer can tell you that you cannot use synthetic or that you have to use their brand. There is a US law that says if they do they have to provide you free of charge for your oil changes. They cannot void your warranty either for using synthetic BUT they can void your warranty for using the wrong weight oil and not following their change intervals. Synthetics are superior to regular Dino oil. Why mfgrs don't recommend them I don't know, but when Harley Davidson was losing money from owners buying synthetic and nit buying their Dino oil, they had an appifany and branded their own cheap synthetic version.

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