Oil Change Time

[XJiggy]

Im going to change my oil tonight or tomm mornight because it is long over due and the oil is looking a little grimey. I have a 98 L6 with 111800 miles on it.
I plan on getting 6 qts of 10W-30, but my question is should I switch to a high mileage engine oil. And if not what purpose oil should I run?
I also plan on replacing the filter with a wix filter.

And today I was cleaning my garage and found a bottle of sea foam. I was wondering if this would be a good time to dump some of that stuff into the carb. It seems pretty simple...Just pour 1/3 pint into the throttle body when the engine is warmed up and running...let it sit and fire it up. However there is a note at the bottom for use in injector cleaning machines, use 50% sea foam and 50% fuel. I dont really understand this note so if someone could tell what it means and if it applies that would be great.

Thanks

[KarlVP]

No, just use regular old engine oil.

Oil is oil is oil. As long as you change it regularly you will do just fine.

And you don't have a carb on your 4.0L if it is a 98. Unless you put it there.

Take that can of seafoam, fill your tank with gas(FULL), and dump it in there.

[XJCreeper]

No, just use regular old engine oil.

Oil is oil is oil. As long as you change it regularly you will do just fine.

And you don't have a carb on your 4.0L if it is a 98. Unless you put it there.

Take that can of seafoam, fill your tank with gas(FULL), and dump it in there.

X2. Just get the correct weight for the temperatures you will run the jeep in. Put the seafoam in the tank to clean the injectors and top end and call it good.

[XJiggy]

alright thanks

[j99xj]

I've been running synthetic mobil 1.

My engine starts much easier in extreme cold with it. (thats come in handy over the last few weeks because its been in the single digits here in CO.)

I also think it keeps the wear down at start up.

I wouldn't use Seafoam. I think it ruined my 02 sensor. I don't use it anymore.

[canadian_xj]

Sorry to kinda thread jack. I heard once that if you go to synthetic oil on a high mileage engine that has known regular oil since birth, it can really mess up the oil pump due to the synthetic clearing old deposits and varnish. I really hope this is a load of cow poop. Please tell me it is.:smoker:

[clunk]

I have read alot about synthetic opening new oil leaks on older engines which have just use regular old dino-juice since birth. I just changed my oil with regular oil the other day, and my rear main is leaking more than ever...so take that however you'd like.

check out: http://www.bobistheoilguy.com/
do lotsa reading, it's a really great site.

[j99xj]

If an engine has that much crap in it with regular oil, the engine wasn't taken care of to begin with.

But with a well cared for engine that has had regular oil changes a switch to synthetic will only give benefits.

I switched to synthetic oil around 3 years ago and I haven't had any mechanical problems. And three 3 years ago I had about 100,000-110,000 miles and now I have almost 130,000.

[XJiggy]

i was just re reading this thread and noticed that I may have misasked a question about sea foam...

I meant to ask should I pour some into the throttle body and if so do i need to mix it with fuel or anything. How much should I dump in? I have read that it can have some negative effects like the o2 sensor stated above.

[8Mud]

Just my two cents worth. But if you've ever cleaned out an intake that hasn't been touched in years. Stick your hand into the bucket you used to catch the junk you washed out and go to the bottom, you will find a small handfull of carbon grit. It's not gum or fluid but almost a solid, feels like sand.
The seal on your intake valve, has got to be air tight. Washing grit into this area, seems dumb. Many people have been washing crap through there valves and cylinders for years, with no apparent bad outcomes. But I for one, will leave well enough alone. Unless I remove the intake (or TB) and clean it out, off the vehicle.

[XJiggy]

well i read that you could just pour it into the throttle body which is what I was planning on doing...so I guess you just push the butterfly valve open and pour some in untill it kills the engine and then wait 5-10 mins and fire it up.

(If incorrect please correct me)

[XJiggy]

yay or nay :party:

[XJPhoenix]

I ran Seafoam into my old 1991 XJ, and was told to 'feed' 1/2 of the bottle into the vacuum tube off of the brake booster. Then, near the end, dump enough of it in there and let it stall. Leave it for an hour of so, then fire it up and watch the smoke billow out.

It didn't work for me.

Maybe I should've poured it down the beast's throat?

:)

[UncleBud]

I think I'd follow a tech writeup from someone who knows what they're doing...pouring shit into the vacuum line don't sound too damn kosher to me.

[Comanchedude]

I think I'd follow a tech writeup from someone who knows what they're doing...pouring shit into the vacuum line don't sound too damn kosher to me.


If anyone reads the side of the can it actually has the instructions.

(Yes most every product sold to the public has instruction for proper use on the label)

And in fact they do recommend that you "suck" the product though the vacuum booster line.
And it would seem this procedure is to avoid someone dumping it down the intake to fast, possibly hydro-locking the engine and causing damage.

[gone postal]

Diggin' up an old thread, but I sucked it up through the vacuum hose and you just do it in very small amounts otherwise the engine will stall. I used 1/2 bottle, probably took 3-4 minutes and shut it off and let it sit for 30min. Some have said to suck up enough to stall the motor, but I decided not to. When I restarted, yes, it smoked like crazy.

[fscrig75]

adding to this old thread...I swith to snyth not to long ago and have zero problems with my 99, and the high-mileage oil, what is the company saying that their regular stuff isn't good enough? its just a gimmick, MTS

[Naked Tree 2x4]

i have used seafoam on multiple vehicles and liked it. just do as the bottle says and slowly pour it in the throttle body. them shut it off and then go drive somewhere.using the brake booster line is just an easy way to get to the intake if it isnt as convenient as it is for an xj to go through the throttle body.

[bcsavage]

did the seafoam to my 240sx that had 300K on it and it gave that motor a nice kick in the butt.

Definately, do the vacuum thing, but have a friend with you to feather the throttle to keep the motor running. I ran one bottle through the vac and one through the tank. The stuff needs to be circulating to do it's job. Smokes enough that you should warn your neighbors what you are doing so they don't call the FDP (that bill will be on your head for false alarm).

[bfred]

I've allways used regular oil. As my truck got more miles on it i did switch to 10w40 though. I figure as the bearings/etc. ware the tollerances become greater and the thicker oil helps keep the pressure where it should be (30psi even on a hot day idling). I also try to use the same brand everytime,(pennsoil for me) different brands can have different additives and I'm afraid the different detergants might stir up some deposits in the motor and cause problems. Better safe than sorry!

[TrueBlueXJ]

I've always run regular oil, specifically Valvoline. I switched to synthetics in a few of my old vehicles and didn't notice any pros or cons. I think it's just a preference thing.

[BBeach]

Ive been running Valvoline Durablend 5w30 in winter and 10w30 in the rest. I tried seafoam, just pour it very slowly in throttle body, no need to hit the throttle, it'll suck it through just fine. Mine didn't smoke like I've seen on videos online, but it did throw me a nice DTC saying i had a misfire....

[rag]

Smokes enough that you should warn your neighbors what you are doing so they don't call the FDP (that bill will be on your head for false alarm).

my neighbor ran our of his house with a fire extinguisher the first time i used seafoam.

another vote for slowly pouring it down the throttle body. turn off teh engine when done, let it sit for a bit (ive let it sit anywhere from 15 minutes to an hour) and fire her up. i have not seen seafoam mess up and o2 sensor personally.