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Unread 09-08-2003, 01:04 PM   #1
pygocentrus
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what kind of oil do you use on your grand cherokee?

i hear mobil 1 is good, but im not sure. what brand do you use and do you like it?

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Unread 09-08-2003, 01:39 PM   #2
Rccarps2
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Right now I use Mobil 1, I have been using it since my first oil change at 3,000 miles. Now I have arund 15,000. I cant really feel any difference, I consider it more of an insurance policy for the engine than anything.

I had an Explorer before I bought my GC and put over 90,000 miles on it with Mobil 1 and never had a problem.
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Unread 09-08-2003, 02:24 PM   #3
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I just use plain old Valvoline 10w30. I think the synthetic stuff is a waste of money. I've never had a problem and I have 110,000 on my XJ and 92,000 on my ZJ.
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Unread 09-08-2003, 03:01 PM   #4
Harald
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Agree on synthetic, waste of money. Also we see synthetic oil is polishing cylinder walls, not very critical on petrol engines perhaps, but may give very thin film of lubricant on diesels. Recommended on V8 is SAE 15W-40 or 10W-40. At -12deg. C, as low as 5W-30. Think brand of oil is of less importance, as ong as brand is f.eks. NATO approved. My own GC has run 100k miles on synthetic, I will continue with this oil as changing oil on "old" engines may harm.
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Unread 09-08-2003, 03:13 PM   #5
pygocentrus
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anyone try the Z-Max before? you put the 3 liquids in your oil, gas, and tranny i think. that stuff works, but 50 bucks a pop everytime you do a oil change.
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Unread 09-08-2003, 03:28 PM   #6
MaineZJ
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I used Mobile 1 in my chevy truck (350) and felt a difference.
So I put it in my CG. However it was their "new engine" stuff. Hopefully next time I'll find it for diesel, supposed to have better lubricity and cleaning agents.
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Unread 09-08-2003, 03:55 PM   #7
96Limited
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Quaker State...works fine for me. I have heard good and bad things about the synthetic stuff...
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Unread 09-08-2003, 04:38 PM   #8
jeepme79
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I had an 89 xj with 225k, and currently have a 98 zj with 136k. I have always used Valvoline 10w-40, or CarQuest 10w-40 (generic Valvoline). Last time I checked the xj was still going strong.
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Unread 09-08-2003, 07:06 PM   #9
JAURS
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I recently switched over from running the generic Mopar dyno oil to Quaker State 4X4 synthetic. I have heard that switching over at high mileage (I swithced over at 140K and now have 142K) can be bad for valve seals, etc... I don't have any oil burn or any weird performance issues from switching and I do drive hard and go off-road quite frequently. I have noticed however that compared to dyno oil, the synthetic has kept my engine temp down slightly and seems to be cleaner and lighter in color.



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Unread 09-09-2003, 08:57 AM   #10
jiggajeeps
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Quote:
Originally Posted by pygocentrus
anyone try the Z-Max before? you put the 3 liquids in your oil, gas, and tranny i think. that stuff works, but 50 bucks a pop everytime you do a oil change.
Every oil change? I thought it recommends every six months. Either way, I put ZMax in my Ford LTD w/40K on it, and my catalytic converter died. Forget the miracle engine potions, just do the scheduled maintenance and oil changes.
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Unread 09-10-2003, 11:38 AM   #11
badnews
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Never and I mean never use a oil additive, they are all bull****, and do nothing except waste you money, if you insist on spending the money, do more frquent oil changes, still a waste of money, but at least it is better than pixxxxx it down the drain. Oh yeah, Pennzoil 10-30 in the summer , spring, and fall, and Syn. Mobil 1 5 w - 30 in the winter.
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Last edited by badnews; 09-10-2003 at 11:44 AM..
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Unread 09-10-2003, 12:02 PM   #12
jeepme79
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Quote:
Originally Posted by badnews
Never and I mean never use a oil additive, they are all bull****, and do nothing except waste you money, if you insist on spending the money, do more frquent oil changes, still a waste of money, but at least it is better than pixxxxx it down the drain. Oh yeah, Pennzoil 10-30 in the summer , spring, and fall, and Syn. Mobil 1 5 w - 30 in the winter.

Have you ever noticed any foam or white sludge with your Pennzoil?
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Unread 09-10-2003, 12:07 PM   #13
badnews
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30 years ago I used Kendall, when I removed the valve covers I had 1/4 OF A INCH OF SLUDGE, I switched to Pennzoil and have never had sludge or foaming since. Pennzoil has refined the oil forulations to a ponit now where it may be one of, if not the best conventional oil around. Mobil 1 syn oil is one of the best and easiest synthetic oils to get. I am kind of a oil nut and have researched this till there just isn't anything new for me to learn. I am going to have to watch Pennzoil though as it and Quaker State have been bought by Shell, if they mess with the oil formulation I may have to switch, but I doubt they will, why mess with a winner .
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Last edited by badnews; 09-10-2003 at 12:10 PM..
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Unread 09-10-2003, 10:37 PM   #14
PDshooter
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Pep-Boys brand of oil 5W-30W
STP or NAPA Gold filter............136K on my I-6
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Unread 09-11-2003, 03:09 AM   #15
5.9 Litre
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MObile 1

I was recommended mobile 1 by the service.
Have been driving it 2k miles and absoulately felt no difference, performance-wise, I don't know if I should have..
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