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#310490 - 10/04/02 08:04 AM Do you prime oil filter?
cluster lizard Offline


Registered: 10/03/02
Posts: 15
Loc: SoCal
When changing oil, do you prime the oil filter with oil, or just install it dry?
I'm wondering since it seems to be a reasonable idea but I've never seen it recommended. What do you think? [I dont know]

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#310491 - 10/04/02 09:37 AM Re: Do you prime oil filter?
segfault Offline


Registered: 09/18/02
Posts: 190
Loc: KY
What I do: install it dry, run engine, check for leaks, park on a level surface and allow oil to drain back into pan, then check level and make a final top-up of the oil.

What is best to do: I'm not sure. Anyone else know?

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#310492 - 10/04/02 09:46 AM Re: Do you prime oil filter?
UncleS2 Offline


Registered: 05/27/02
Posts: 2998
Loc: Far North East Texas
Since I began changing my own oil again, I've always primed/prefilled my new filter. On my car, the oil filter hangs vertically, so it's easy. Is it best to do it? Yes. Is it absolutely necessary? No. Virtually none of the quickie-lubes or dealerships do it. And on a horizontal mount, you can only fill less than half of it anyway.

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#310493 - 10/04/02 10:15 AM Re: Do you prime oil filter?
briarhopper Offline


Registered: 06/09/02
Posts: 37
Loc: South Bend, In.
Caterpiller recomends installing it dry, otherwise you are putting unfiltered oil in your engine.

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#310494 - 10/04/02 12:51 PM Re: Do you prime oil filter?
cluster lizard Offline


Registered: 10/03/02
Posts: 15
Loc: SoCal
Yes, you're allowing unfiltered oil to flow into the engine, fresh oil, right from the bottle. I assume it is clean [Big Grin]

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#310495 - 10/04/02 02:09 PM Re: Do you prime oil filter?
Patman Offline



Registered: 05/27/02
Posts: 19261
Loc: Oakville, Ontario
I always fill the filter up! I did an experiment once and put it on dry and there was a noticeable difference in how long it took for the oil pressure to rise off the zero mark. With the filter filled it comes up almost instantly (although still not as quickly as it will on subsequent cold starts)

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#310496 - 10/04/02 03:10 PM Re: Do you prime oil filter?
joee12 Offline


Registered: 07/04/02
Posts: 4106
Yes, I do it on both cars. Like Patman said, if you try it you will notice a few seconds difference. -Joe

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#310497 - 10/04/02 03:31 PM Re: Do you prime oil filter?
ex_MGB Offline


Registered: 08/30/02
Posts: 597
Loc: Salisbury, MD
I do it.

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#310498 - 10/04/02 04:48 PM Re: Do you prime oil filter?
Chris Offline


Registered: 05/27/02
Posts: 534
Loc: South
There is no reason NOT to do it. [Wink]

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#310499 - 10/04/02 04:50 PM Re: Do you prime oil filter?
Chris Offline


Registered: 05/27/02
Posts: 534
Loc: South
Does Cat. want you to have a good dry, cold start so you have to rebuild sooner or what? [Confused]

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#310500 - 10/05/02 09:49 AM Re: Do you prime oil filter?
segfault Offline


Registered: 09/18/02
Posts: 190
Loc: KY
Addendum to the above: I *can't* prime my filter, as it's a bottom-change, cartridge type. See the thread on the "BMW filter philosophy vs. other manufacturers."

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#310501 - 10/05/02 09:53 AM Re: Do you prime oil filter?
Anonymous
Unregistered


quote:
Originally posted by Chris:
Does Cat. want you to have a good dry, cold start so you have to rebuild sooner or what? [Confused]

You know that you carefully put clean oil into your filter. The Cat factory doesn't know what happens in the field, so they take the safer route. Priming the filter with clean oil is best, installing a clean, dry filter is second best, some moron filling a filter with oil plus whatever else falls in or washes off his dirty hands isn't good at all.

Ken

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#310502 - 10/06/02 05:28 PM Re: Do you prime oil filter?
msparks Offline


Registered: 06/11/02
Posts: 3324
Loc: Clarksville, Tennessee
I don't,

I just just put the filter on and go. Unless your engine is shut down for days, your will have plenty of boundry lubrication on the moving parts until the fresh oil gets pumped through(UNLESS you change your oil when its 40 below)

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#310503 - 10/06/02 05:46 PM Re: Do you prime oil filter?
BOBISTHEOILGUY Offline


Registered: 05/27/02
Posts: 1874
Loc: Ocala, Florida
quote:
Originally posted by msparks:
I don't,

I just just put the filter on and go. Unless your engine is shut down for days, your will have plenty of boundry lubrication on the moving parts until the fresh oil gets pumped through(UNLESS you change your oil when its 40 below)

Actually, some boundary additives(not all) will provide enough protection for an engine to endure a momentary dry start. The design of the engine first normally has some oil residue left in the bearing areas around the crank which prevents lower end noise when first cranking with a dry filter. Notice that normally it is the top end where the valves are clattering that suffers the lack of lubrication when this senerio is in play.

Boundary additives do not run off like the hydrodynamic property of oil, so normally it doesn't matter how long you may let it sit, it will still have that on the surface unless it has been exposed to open harsh enviorments such as weather and such, which will not happen if in a car.

Putting oil in a filter prior to starting an engine is a good idea provided that great care is used not to contaminate the oil going in. If you have a system like mine that lays on its side, you cannot put oil in prior to installing as it will just pour back out as you put it on the car.

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#310504 - 10/06/02 06:03 PM Re: Do you prime oil filter?
Patman Offline



Registered: 05/27/02
Posts: 19261
Loc: Oakville, Ontario
Bob, even if your filter sits sideways, such as the one in my wife's car too, you can still add a little bit of oil. I typically add about 100ml or so of oil to her filter before putting it on. A little bit is better than nothing. I see no reason not to do it, why rely on boundary lube here when it takes only a few moments to fill up a filter, and it'll offer a slight bit of extra protection? Sure we are splitting hairs here, but it's just something that makes sense to do.

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