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Unread 11-19-2013, 06:34 PM   #1
Neves7j7
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What oil

What oil should I run in my 2001 Grand Cherokee 4.7 with 130k miles. Should I go full synthetic or is that too thin?

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Unread 11-19-2013, 06:38 PM   #2
AntiPrius
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Quote:
Originally Posted by Neves7j7 View Post
What oil should I run in my 2001 Grand Cherokee 4.7 with 130k miles. Should I go full synthetic or is that too thin?
Nothing wrong at all with using a full synthetic. I use full synthetic it in my Wrangler. Mine isn't my daily driver so it only sees about 3-4k miles a year, so I just change the oil once a year. Regular oil is fine too, but synthetic allows you to go further between oil changes, and some believe it lessens internal wear. I'm not sure on that part myself. It may or may not be true.
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Unread 11-19-2013, 08:20 PM   #3
schitzangiggles
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Synthetic Oils allow you not only a greater interval between changes, but also a greater level of protection because of the lower cold pour points and the much higher temps it can withstand before it breaks down. a 10w30 weight synthetic oil and a 10w30 conventional oil have the same viscosity at room temp, so the synthetic isn't "Thinner". It gets that misnomer because of the superior detergents that are in synthetic oil that really clean the seals of varnish and gum which may result in a short term leak with the first use of synthetic oil. If you have a seal that leaks with synthetic and doesn't go away in short order, guess what, it wasn't long for this world anyway.

When you expose conventional oil to temps above 165 degrees fahrenheit and they begin to break down, AKA oxidize.
Oxidation causes acid formation, sludge, varnish and degrades seals. It clogs oil passages and reduces the lubrication ability of the oil.

Synthetic oils have a higher quality base stock that they are made from in addition to better additives like anti foaming agents, detergents, seal conditioners than conventional oils. That is why they last so much longer, they resist the damaging effects of heat, fuel, combustion contaminants and water much better than conventional oil.

Ever try to pour conventional oil at 0 or below? Put a thermometer in your freezer and see how cold it will go. My deep freeze operates at about -20 fahrenheit. Conventional oil is like cold honey whereas the same 10w30 Mobil One synthetic pours just like it does at room temp. So going into winter, what oil do you want to use on a cold morning? When you run a thinner oil to try and compensate for the colder initial temps, when it reaches operating temperature the oil is too thin.

Run the recommended weight oil, just in synthetic.


In the picture, both oils were heated to the same temperature, which one you think is going to lubricate the best?
synthetic_vs_conventional_oil-13.jpg

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Unread 11-19-2013, 08:30 PM   #4
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Quote:
Originally Posted by Neves7j7 View Post
What oil should I run in my 2001 Grand Cherokee 4.7 with 130k miles. Should I go full synthetic or is that too thin?
I use Mobile One Extended Performance 5W-30 in my '01 GC 4.0. I change it at 8,000 miles. I use a NAPA 21515 oil filter...it is for a 5.0 Ford BUT is 36% larger.
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Unread 11-19-2013, 08:54 PM   #5
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Unread 11-20-2013, 05:58 AM   #6
vadslram
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I wouldn't waste my money on synthetic in a 130+k engine unless you are confident in your gaskets and seals or are planning on redoing them anyway.
I love synthetics and it is all I use in all my engines from weed wacker to family truckster. but in general the additive package in synthetics are much more robust and will clean out crud that has accumulated over the miles and plugged up leaks.
On my 90 I switched over when I bought it and it had around the 130k but it already had a small rear main leak and I knew I was going to replace both mains and the pan and valve cover gaskets. I ran synth for a little under a year before I did the work and I was losing about a quart every other tank towards the end..all lost to the ground.
Now I lose maybe a quart between oil changes and most of that is slipping past 156k old rings.

Regardless of synth or Dino, with modern oils you don't have to worry about too thin. In fact thinner oils are better for your engine because it pumps faster and on startup you get oil to all the bearings so much faster. 0-30 will still stay thick enough after warmup to lubricate well.
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Unread 11-20-2013, 07:24 AM   #7
schitzangiggles
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I have 155,000 ish miles on mine and running 10w30 Mobile One since 90,000 miles when I bought my 1993 YJ back in 2005. Nary a leak, well at least from the engine
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If you love wealth more than liberty,the tranquility of servitude more than the animating contest of freedom, go home from us in peace. We seek not your counsel nor your arms. Crouch down and lick the hand that feeds you. May your chains sit lightly on your shoulders and may posterity forget that you were our countrymen.
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"Your right, the Tea Party and the OWS are the same, just like the America Revolution and the French Revolution were the same. The only problem is the American Revolution ended with Liberty, Freedom, Justice for all and a shining light upon a hill. The French Revolution ended with lynchings, guillotines, murder and socialism. So yeah, I could see how one could confuse the two..."

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Unread 11-20-2013, 12:41 PM   #8
rjbruzan
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215k in my old Xj and 170K in the still older XJ. I run Rotella T6 full synthetic with NO leaks. The Synthetic causing leaks is an old wives tale.
Quieter starts on cold mornings is reason enough. But longer oil change intervals also.

Ron
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Unread 11-21-2013, 06:03 AM   #9
vadslram
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Originally Posted by rjbruzan View Post
215k in my old Xj and 170K in the still older XJ. I run Rotella T6 full synthetic with NO leaks. The Synthetic causing leaks is an old wives tale.
Quieter starts on cold mornings is reason enough. But longer oil change intervals also.

Ron
Synths haven't CAUSED leaks since first gen Mobile 1.But it did then because their packages weren't compatble with the period seal materials, It is the same with biodiesel in old fuel systems and alchohol in gas. The stuff ate rubber and once they went to nitrile or silicone that problem went away.
What they do is open up hidden leaks and make any drip more visible. Synthetics have a much greater heat affinity and for the same amount will spread further than dino oil. That means that even a tiny drip will make a big oil spot and look like a big leak.
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