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  #25  
Old 04-10-2015, 05:31 PM
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Re: Switching to Synthetic Oil in High Mileage Engine

until now I was using Mobil-1-10W-30, it does seem to be a "higher pitched knock", we usually do the oil changes ourselves (i could kick myself) for taking it to Jiffy Lube! I have read some of their reviews and I don't see a lot of good stories.
We are going to change the oil today and put Mobil-1-10W-30 w/ Fram Ultra Synthetic Oil Filter and will let you know how it turns out
I was talking with another jeep owner today and he suggested putting in "Lucas oil treatment" what are your thoughts on that?

Thanks again for all replies

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Old 04-10-2015, 05:42 PM
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Re: Switching to Synthetic Oil in High Mileage Engine

Quote:
Originally Posted by LadyKenai View Post
until now I was using Mobil-1-10W-30, it does seem to be a "higher pitched knock", we usually do the oil changes ourselves (i could kick myself) for taking it to Jiffy Lube! I have read some of their reviews and I don't see a lot of good stories.
We are going to change the oil today and put Mobil-1-10W-30 w/ Fram Ultra Synthetic Oil Filter and will let you know how it turns out
I was talking with another jeep owner today and he suggested putting in "Lucas oil treatment" what are your thoughts on that?

Thanks again for all replies
If you can find the Castrol 20-50 or 10-40 from anyone that should help.
I used STP Oil Treatment.....

Is it a lifter making noise, or something in the bottom end?

Lifters can often be quieted down by a Seafoam treatment, but then you'd want to change oil afterwards if you put it in the crank case.
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  #27  
Old 04-10-2015, 07:52 PM
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Re: Switching to Synthetic Oil in High Mileage Engine

If you've been running synthetic forever, the innards of the engine are probably looking really good. It is possible that the dino. oil has gummed something up and, if it's a fairly high pitched knock, it could be something like a lifter. I'd start with your oil change and see what happens after a few hundred miles. Personally, I am not a big believer in all the different additives as, if you've always taken good care of it, especially timely servicing, you shouldn't really have too many issues. I guess additives have their place on poorly cared for vehicles.....I just don't use them in any of my vehicles. Just my 2 cents.
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  #28  
Old 04-10-2015, 10:22 PM
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Re: Switching to Synthetic Oil in High Mileage Engine

ok! put Mobil-1-Synthetic-10W-30 w/ Fram Ultra Synthetic Oil Filter
let it run for about 10 minutes, it does sound a 'little quieter'
but will take it for a ride tomorrow, the noise started about 70 miles down the road so ~ i think i will take it 70 miles and just test that out, will come back with a report then
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Old 04-11-2015, 10:33 PM
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Re: Switching to Synthetic Oil in High Mileage Engine

Well took it for a ride ... less than a mile down the road, the whole jeep started shaking, lost power, noise got really bad, it all happened so quick I am just in tears! I managed to start it back up and crawl home, it didn't have much power (pushing on the gas) then halfway back home it gained some power ? ! ? ! I don't understand it!
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Old 04-12-2015, 10:02 AM
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Re: Switching to Synthetic Oil in High Mileage Engine

Like I said in my Post No. 23, with 253+K miles, it may be time to start thinking about some major engine work if you plan to keep the vehicle. For sure it's time to have someone that is knowledgeable have a look at it and see if they can determine where the problem(s) is/are, and if it is possible to "save" the engine for a little longer. The 4.0 engines were pretty rugged units, but they are not immune to problems at high mileage. Good luck and let us know how it goes.
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