Kestas
Staff member
Filterguy, I know your's was a rhetorical question, but I think warranty was 12 months/12,000 miles, whichever came first.
Adding oil to filter before install
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Well it kinda was..
I think some warranties were 6 months back then.
I also believe, if someone's got the owners manuals, that oil changes were every 1,000 miles.
I could be wrong on both accounts but that's going from memory.
Now imagine that today.....lol
I think some warranties were 6 months back then.
I also believe, if someone's got the owners manuals, that oil changes were every 1,000 miles.
I could be wrong on both accounts but that's going from memory.
Now imagine that today.....lol
I prefill all of my filters. Always have, always will. Screw what the wannabe engineers have to say about it. I know my engines are quiet on startup after a oil change with a prefilled filter compared to not being prefilled. That's one aspect the prefill naysayers seem to forget....the engine is essentially running dry for a few seconds until that filter fills up and sends oil out to the galleys. Considering prefilling is so simple to do, I don't know why someone would choose not to; that is unless the filter is mounted upside down ZR1 style or totally horizontal, but both of those configurations are fairly rare these days. In the end, it's your engine, treat it how you want to.
[ October 28, 2005, 07:17 PM: Message edited by: 99 ]
[ October 28, 2005, 07:17 PM: Message edited by: 99 ]
You don't add any extra oil. If your car takes 5qts with a filter change, you add 5qts whether you prefill or not. Simply put, nothing changes.
I fill my filters when possible to lessen the time that the engine runs with zero oil pressure. But there is another good reason to do this in my opinion. The shock of pushing that oil through the media that first time has me thinking that the media may survive intact better with a prefilled filter. I think I read a
TSB from Baldwin one time about prefilling their oil filter for a particular heavy truck application because it was found that the media was being damaged from the first startup when installed dry. Maybe this is more of a problem with the larger filters used in trucking, but nevertheless, it could be a factor to consider. Maybe Doug Hillary would comment here.
In a horizontal filter application, like on the 4.6 Ford V8, I just fill it about half full and let the oil soak into the media for a while, then install without losing any oil. I don't like hearing those bearings rap for a few seconds on a worn engine if I don't have to.
TSB from Baldwin one time about prefilling their oil filter for a particular heavy truck application because it was found that the media was being damaged from the first startup when installed dry. Maybe this is more of a problem with the larger filters used in trucking, but nevertheless, it could be a factor to consider. Maybe Doug Hillary would comment here.
In a horizontal filter application, like on the 4.6 Ford V8, I just fill it about half full and let the oil soak into the media for a while, then install without losing any oil. I don't like hearing those bearings rap for a few seconds on a worn engine if I don't have to.
Kestas
Staff member
You're correct on both counts.... split the oil charge when adding to the filter, and yes, there is still a film of oil on the parts. It's called "boundary lubrication", which protects the critical surfaces until you get hydrodynamic or some other steady-state lubrication.
Kestas
Staff member
My 57 Chevy had no oil filter! Who knows what coursed through that engine!!... especially with the oil at that time!!!
my 55 inline 6 didnt have one either, but i figure teh amount it was burning which kept me adding fresh oil. it sort of balanced out
Refer to comment #1. Never prefilled a filter, never will. Ran many motors over 100k mi. without a lube-related failure. Different strokes for different folks, I guess...quote:
Originally posted by 99:
I prefill all of my filters. Always have, always will. Screw what the wannabe engineers have to say about it.
Knock yourslef out, dude. Personally, I don't have alot of time to waste on useless activities. BTW, I am an engineer. What do you do for a living?
I know my engines are quiet on startup after a oil change with a prefilled filter compared to not being prefilled.
Most of the noise referred to (bearings rapping is another issue altogether) is hydraulic lifters going down, which has little to do with lubrication in the few seconds after startup.
That's one aspect the prefill naysayers seem to forget....the engine is essentially running dry for a few seconds until that filter fills up and sends oil out to the galleys.
I have a open diff sitting on piece of newspaper in the corner of my garage that is still oozing oil after sitting for a month.
Considering prefilling is so simple to do, I don't know why someone would choose not to; that is unless the filter is mounted upside down ZR1 style or totally horizontal, but both of those configurations are fairly rare these days. In the end, it's your engine, treat it how you want to.
I agree, I've prefilled, or primed, mine for years and always will. Even my Mazda6i, which has a cartridge style filter, I insert the filter in the holder and 'wet' the filter with fresh oil.
I thought that since oil pumps are positive displacement, that meant that oil did not move through the engine without the oil pump providing pressure? If so, then wouldn't the prefilled oil in the filter not move until the oil pump has pressurized the system and pushed oil through the filter to move the prefilled oil up into the engine?
Precisely what I do with my 454 pickup and '95 Civic. I'm a firm believer in pre-filling the filters whenever possible- I like seeing the gauge respond or light extinguish ASAP! The old Slant Six, unfortunately, has the filter "backwards", so I crank the engine for 15 seconds or so with the coil wire disconnected. It still raps a bit when it fires but every bit helps...!
That's true - but with the oil filter already "filled" to an extent, it will take less time for the oil pump to pressurize the system because some of the space it needs to fill, is already holding oil.
acewiza-Do what you want. It's your time, your car and your money. That's the beauty of living in America-you have a choice. Likewise, I'll do what I want and what I know is better for me. Now go roll around in that gear oil that's seeping onto your garage floor. Dude.
Kestas
Staff member
Oil changes (and chassis lube) were every 2000 miles.
I've never pre-filled a filter. Haven't blown an engine up yet. Been doing it for 30 years.
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The conservative wrenches I know do not prefill the filters. They bump the engine a few times before starting it. The school of thought being that any (un)dry cranking will be void of the thrust of the combustion process.
I don't prefill ..except my MEGA bypass filter. It adds 3 or 4 quarts to the system and still purges air from the cotton media as it gets saturated. Leaving it filled for hours doesn't quite do it.
I don't prefill ..except my MEGA bypass filter. It adds 3 or 4 quarts to the system and still purges air from the cotton media as it gets saturated. Leaving it filled for hours doesn't quite do it.
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