Synthetic oil - JeepForum.com

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post #1 of 22 Old 01-20-2003, 12:23 AM Thread Starter
rJEEP
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Synthetic oil

Going for an oil change in a few days.....Should I go synthetic?


98 ZJ 4.0 HO
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post #2 of 22 Old 01-20-2003, 08:13 PM
Camster
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got for it. if ya hate to change the oil and willing to lay down some extra cash. it's worth it in the end. saves ya money.

Cameron



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post #3 of 22 Old 01-20-2003, 09:05 PM Thread Starter
rJEEP
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Is it a big procedure? I hear of people getting oil leaks after doing the switch...don't know if it holds true on Jeeps.

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post #4 of 22 Old 01-21-2003, 08:37 AM
99 Laredo
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I've always used synthetic in all my vehicles and never experienced an oil leak in any of them. So I think thats an old wives tale......It is a good idea to do a engine flush before you switch over to synthetic though....

99Laredo

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post #5 of 22 Old 01-21-2003, 10:47 AM
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Switched to synthetic myself after I bought my Jeep with 75k. Still planning on changing the oil every 3000-3500 miles. Haven't noticed any leaks in just under 3k miles.

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post #6 of 22 Old 01-21-2003, 12:07 PM Thread Starter
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notice any advantages?

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post #7 of 22 Old 01-21-2003, 01:28 PM
99 Laredo
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I found my jeep started easier with the synthetic oil, you CAN go longer on your oil change intervals too. A friend of mine went almost 10,000 km before his next change and the oil was just as clean as the day he put it in. Although I wouldn't go that far....

99Laredo

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LOL, I hit the Veeeeeeeeeeeery edge of a 20x30 tarp with my riding mower

BOOOOM!!!!! the tarp dissapeared and my mower looked like it had a lift kit
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post #8 of 22 Old 01-21-2003, 09:39 PM
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FWIW, I have spent a fair amount of time at Miata.net, where they have a VERY active forum (more than 19,000 members and lots of discussion), and this topic has been kicked around quite a bit. There are strong opinions on both sides. Some general observations:

If you have an oil leak, it *may* be more noticable with synthetic.

If you tend to stretch out your oil changes a bit, use synthetic.

Synthetics are recommended for *extreme* conditions or very cold weather.

If you change oil regularly and often (say, every 3,000 miles or so), dino oil is probably just fine for you.

Some people believe their engines actually run more smoothly with synthetic. Maybe so.

If you don't mind the additional cost, give it a try; it can't hurt and you might like it. If you want, you can always go back to dino.

I may have missed a thing or two but there's the basics. As always, YMMV

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post #9 of 22 Old 01-22-2003, 06:09 AM
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I use Mobil 1 5-30 full synthetic and am very happy with it. I live in Denver and use my Jeep in extreme conditions.

Here's the rule of thumb:

If you have low miles (in my case 40000 for a 1999) there is NO reason to flush the engine (assuming that the oil has been changed at prescribed intervals). The synthetic oil will "flush" and eventually clean the internal parts.

I plan on changing my oil at 5000 mile intervals with the synthetic and a Mobil 1 filter. I change my own oil and pay $40.

Richard

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post #10 of 22 Old 01-22-2003, 05:55 PM
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I use Mobil1 higher-mileage formula. It will free up some horsepower and doesn't require you to flush the engine on higher-mileage Jeeps.

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post #11 of 22 Old 01-25-2003, 07:14 PM
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I switched to synthetic about 4-5,000 miles ago. It did start leaking after the switch.

More than likely, what happened is the seals probably had sludge build up on them. Synthetic does a good job of cleaning out the internals of your engine, and probably removed this sludge, exposing an area for oil to leak out.

It leaked bad at one point, enough to add an oil additive to it, and enough that my dad was suggesting to drain it, and put Dino back in.

Synthetic is also suposed to soften older seals, if it's true or not, i do not know, but it leaks about 1/2 of what it used to. I haven't top'ed it off for quite a while now.

The only thing I did after changing to synthetic, was to change the oil filter about 1K ago, and I will probably change the oil once the new filter hits 3K.

Troy - TSR6

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post #12 of 22 Old 01-25-2003, 07:19 PM
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there are many vehicles out there who still get 200,000+ miles on them before the engine goes with just regular oil, I really don't see any point in changing over and ******* over the extra $$$ when chances are my vehicle will do just fine off of regular 10W30 oil. Most people won't even keep their vehicle for 200,000 miles so if there is any benifit in the long run to useing synthetics I just don't see it.

Just my opinion.

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post #13 of 22 Old 01-25-2003, 07:22 PM
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Quote:
Originally posted by JeepGuyRyan
there are many vehicles out there who still get 200,000+ miles on them before the engine goes with just regular oil, I really don't see any point in changing over and ******* over the extra $$$ when chances are my vehicle will do just fine off of regular 10W30 oil. Most people won't even keep their vehicle for 200,000 miles so if there is any benifit in the long run to useing synthetics I just don't see it.

Just my opinion.
My Jeep has 127,900 on it. Only part of the car I worry about anymore is accually the engine. Had a anti-freeze leak today from a fitting that worked itself loose.

The only real work it needs, is to the NSS. Needs to be cleaned.

Troy - TSR6

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post #14 of 22 Old 01-27-2003, 04:26 PM
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I have heard the same thing about synthetic...possibly oil leaks. Go with Penzoil High Milage Vehicle. Its great...

~~Brad~~
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post #15 of 22 Old 01-27-2003, 04:47 PM
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Originally posted by brad335
I have heard the same thing about synthetic...possibly oil leaks. Go with Penzoil High Milage Vehicle. Its great...
It really isnt a problem anymore though. I think the seals have finally softened up and slowed on the leak. It still leaks a little bit, but I do not notice unless the car is sitting for a couple days, or when i get under the car on the lift, you can see where its dripping on the pan a bit.

I just carry an extra quart around just in case.

Troy - TSR6

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