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Old 10-28-2010, 11:22 PM
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time to change oil but....

It is time for an oil change but I really want to clean/flush it out cause my '93 yj is at 105k original miles and I want and gunk cleaned out. What is the best product to use? seafoam? something else?
Also what is the best oil to use for here....castrol gtx? royal purple?

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Old 10-29-2010, 03:15 AM
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anyone? 24 views and not one answer?

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Old 10-29-2010, 03:37 AM   #3
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I usually just drain it when its still hot and that seems to work good. With the flush products its really just up to you. That question is a huge discussion and there is really not a completely right answer. I use 10w 40 castrol high mileage oil and a can of restore and it seems to be fine. Its really a personal preference.
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Old 10-29-2010, 04:50 AM   #4

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Just be careful with using Seafoam in higher mileage motors, there have been some horror stories. If your engine isn't leaking run synthetic if you have the money to do so, that'll help clean it out.
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Old 10-29-2010, 11:33 AM   #5
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The problem with flushing an engine with higher miles is that some of the "gunk" has actually settled into places eg. seals, valve stem seals etc. and when you clean this out you realize how much wear thay have on them because all of a sudden you can start blowing smoke and leaking where oil is now freely able to pass by these once "gunked up" areas.
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Old 10-29-2010, 11:52 AM   #6
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If there have been no problems and you have been changing the oil regularly I would leave it alone. I think you're looking for a problem if you flush it.
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Old 10-29-2010, 02:45 PM
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hmmm... that all makes sense. thank you
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Old 10-29-2010, 03:03 PM   #8

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I put a 1/2 can of seafoam in the oil, drove it for 100 miles then changed the oil. Put the other 1/2 can thru the intake manifold and cleaned it out.

The engine puts out more horsepower, is now faster off the line, and is able to better hold interstate speed (at least 65) after doing it. 160,000 miles on I-6. I absolutely recommend the seafoam treatment.

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Old 10-29-2010, 08:07 PM   #9
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i have used seafoam twice on my jeep and my dodge, my dodge hated it and now has oil pressure issues, my jeep, shes a trooper and took it like a champ with no ill effects.

if you want something to clean it out that wont affect the viscocity of the oil pour in a qt of atf. ATF is 1/4 detergents and takes one hell of a beating inside a tranny. but do this about 100-200 miles before an oil change.

but as stated in previous posts flushing any system carries with it a risk of causing leaks that were not there before as you remove a piece of gunk that was blocking a small passage to the outside world where fluids are not welcome.

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