prefill new oil filter?!?

[mikeny59]

Was going to hijack oversized filter thread, chose not to.

I always prefill my '98's oil filter to build up pressure quicker, end up wasting some Mobil but what the hey.

Still going to do this, is this a common practice/worth doing?

[93XJdude]

i do it and everyone i know does it.

[jeepdude10000]

i find if u let is sit after puting oil in the filter , a lot will soak into the filter itself, the put it on quickly.

[Fish'nCarz]

I've wondered about this too. If you just poured oil into the top of the head, and the engine is pretty cool, is this beneficial or just to make you feel better, like whistling in the dark?

[mikeny59]

I keep topping it off, end up losing maybe half the oil when it goes horizontal.

Maybe I'll just half fill -it, whip it on real quick before it begins drooling on my hand, that's when the hand tremors begin :gee:

probably will still have as much oil in it anyway, and none on my hands,

thanks for the brainstorm,


Fishncars, even those lipless fish you and I prolly catch knows that synthetics cling to everyting (weird mood tonite ha ha ha)

I can't whistle for s#&t, but I can certainly mimic the sound of five dollar a quart oil flowing unimpeded through an engine onto the floor because I FORGOT to reinstall the drain plug and not being smart enough to at least have left the drain pan beneath the motor instead of anally removing it before the job was done... been there done that...

[Runnin'OnEmpty]

I always prefill the filter, and have done it as long as I can remember. On the XJ,I fill it just to the point where it won't spill when I spin it on. It's not completely full, but better than being completely dry.

I feel like the engine builds oil pressure a little quicker with a pre-filled oil filter.

[mikeny59]

x2, pom

[jeepdude10000]

its better to do an oil change just after u have good oil pressure.

I run my enging for 4 min, the drain oil , and refill and start while engine still has lubrication, no dry start that way.


Just my $110.00 (u know instead of $0.02)
Buddha, Buddha, Buddha!!!

[mikeny59]

thats' a good idea, but i'm more the leisurely type, it takes more than four minutes just to coordinate the task :dunce:

I hate working on the engine when its' hot...

[scoobyxj]

its better to do an oil change just after u have good oil pressure.

I run my enging for 4 min, the drain oil , and refill and start while engine still has lubrication, no dry start that way.


Just my $110.00 (u know instead of $0.02)
Buddha, Buddha, Buddha!!!
Good in theary, but infact your leaving dirty oil in the moter by doing that. Now weather, or not it makes a huge difference (assuming your doing recomended timely changes) could be debatable. I have always felt as long as you change it regulerly the little bit of oil that stays in the moter won't carry enough dirt to make a difference.


Oh, and on topic I have always prefilled my filter too.

[mikeny59]

thats another reason i'll let the oil drain for hours while i do other stuff, sometimes overnite.

I've always attached a 4" diameter magnet to bottom of pan, near drain hole, and remove it right before I drop the oil.

my theory is that any metal will flush out/w old oil, but i also know metal become magnetized, hoping that area of the pan stays weak enough to let shavings - IF any - vacate.

[goodburbon]

Never have prefilled, pressure within a few seconds and no blown motors. Oh and Scooby, WTF is with your spelling in that last post?

[97xjstock]

im pretty paranoid,,,i fill the filter,,,then once oil change is done,,,i pull the center plug wire from the distributor and crank it for a bit,,,reattach wire and start it,,,i figure its turning over slow/virtually no rpms and pistons arent being slammed down while the rest of the filter fills up,,,,

[UNCC_99XJ]

im pretty paranoid,,,i fill the filter,,,then once oil change is done,,,i pull the center plug wire from the distributor and crank it for a bit,,,reattach wire and start it,,,i figure its turning over slow/virtually no rpms and pistons arent being slammed down while the rest of the filter fills up,,,,

Now that's paranoid...lol

I've never added any oil to the filter before installing it. I make enough of a damn mess taking the old one off, why add new oil to the used oil thats now on the ground?..lol. No engine problems on mine either, and so far at 86K.

[RedHeep]

Good in theary, but infact your leaving dirty oil in the moter by doing that.

Dirty oil is better than no oil. The amount of oil left in the engine as compared to the amount you just put in is negligable. I'd rather have some oil hanging around the top end than not, dirty or clean.

[RedHeep]

im pretty paranoid,,,i fill the filter,,,then once oil change is done,,,i pull the center plug wire from the distributor and crank it for a bit,,,reattach wire and start it,,,i figure its turning over slow/virtually no rpms and pistons arent being slammed down while the rest of the filter fills up,,,,

Turning slowly is the point. There is no benefit from cranking an engine without the coil wire installed. The oil pump can't turn fast enough to produce any oil pressure or volume. To be truly paranoid, you'd have to prime the pump, but now you're talking some really ludicrous stuff.

[goodburbon]

I got 160k and no problems, you guys are silly.

lastara:looser:

[1985xjlaredo]

Well the best thing to do is to prime the filter with Lucus Oil treatment. It is thick and soaks the filter really well.
If you'll notice there is a big difference in the weight of the old oil filter and the new Oil filter!

[Jim Mesthene]

I got 160k and no problems, you guys are silly.


People who can imagine how an engine works, and can picture it running without oil pressure, worry about such things.

People who know how motors work from long experience, think pre-filling oil filters is a demonstration of too much imagination.

[WobblesXJ]

Never prefilled my filters, 200k and going. Not so much as a puff of smoke or a valve rattle.

The renix turns over a bunch of times before starting anyway so even if you did prefill the filter no pressure is pushing the oil around anyway and it's moving without lubrication, meh.

You guys are silly.

[2001XJeep]

I've never bothered to prefill the oil filter because it will just make too much mess and waste. But if you're really concerned, why not just pull the fuel pump fuse and crank it over till you get pressure?? Then plug the fuse back in and away you go. Seems a lot easier than trying to prefill a filter that's installed horizontally...

But it all seems like a waste of time to me. Between the 5 4.0's I've owned (total of over 500k miles) I've never prefilled and have never had any engine oil-related problems.

[KarlVP]

No, I don't prefill my filters. I've never had any oil related problems.

And for the record, running the motor for a bit before doing an oil change, stirrs up the sediment into the oil, and it goes out when you pull the plug. If you let it get all the way cold before you change it, you are talking sludge factory.

[ILLXJ]

I prefill mine, before I start the oil change. The filter has time to soak up the oil & when I put it on no mess. I don't know if it makes any difference but it seems that the pressure comes up quicker. I know it does on the wifes Durango. JIM.

[o2bgpn]

Don’t waste my time pre filling. I’ve been changing my own oil since ‘77. I’ve owned many different cars. Honda, GM, Mazda, Toyota, Jeep, VW, even a Russian Lada Niva 4x4 and others. A few I owned over 10 years and most had over 100k miles.

You probably start your car cold in the morning over a 100 times between oil changes. Say it took a quarter second to get from the output of the oil pump to the farthest moving part of your engine (which would be pretty darn fast). That means that part of your engine would be without oil for at least 25 seconds between oil changes. You do far more damage to your engine during morning start-up then the 2 seconds it takes to build pressure when you change your oil. Besides, oil leaves a film (that’s its job). The 15 minutes between when I shut off the engine, change the oil (while drinking a beer), and restart the engine to rebuild pressure (and look for leaks) is not enough time for the oil to “sheet” off the metal.

I agree with others who say pre-filling is silly.

[mikeny59]

Decided to fill w/a little oil, not enough for any major leakage, and pull the coil wire and crank until I see prssure,

thanks for all the info, appreciated,

Mike

[Jim Mesthene]

If you're going to be silly, pulling the coil wire isn't going to be good enough. You're still loading the bearings from the compression.
You'd have to remove the plugs to unload the bearings while you crank up oil pressure; don't forget to disable the ignition primary circuit to avoid fire risk. You'll need to unplug the injectors so you don't get raw gas washing the oil off the cylinder walls while you're cranking.

[lilredwagn]

I agree with others who say pre-filling is silly.

I thought pre-filling was silly, and now I have tape on my face! :(

[mikeny59]

I think we all do things to our vehicles - and in other aspects of our lives - that are overkill/redundant/or maybe just plain old unnecessary, but can't hurt; just waste thirty seconds getting involved in a mineral vs. sythetic thread:doh:

I just wish my oil filter was vertical hasta ....................

[mattyg]

For Marine Diesals, manuals will say to soak the filter with oil for a few hours before installation to reduce differential pressure. The filters go on veritcal usaully so spillage is minimal. In my XJ i'll do the same soak filter for an hour then drain half and slap her together. More critical in a big diesal to get instant oil pressure most have prelube pumps aswell.

On a side note i love working on marine diesals, detroit, cummins, yanmar, peilstick volvo penta love them all
yaaar matys

[Hellbent]

i've always prefilled mine, my dad always did it. i already have the filter in my hand, and the oil right there. it isn't any trouble, and it certainly doesn't hurt anything. i don't know what other people are doing, but it doesn't make any mess for me. plus it makes me feel better, and that's all that matters. :D

[johnlv6]

That's not something i've ever done.