I was doing some research on extended oil changes and reading information on filters and came upon several people saying not to fill up the new oil filter with oil because its not filtered. Now as long as i have ever been doing oil changes i have always prefilled any filter i could, presoaked catridge filters, even filled upside down filters enough to get the elements wet. I always thought oil was filtered before it went into the bottle. Is that not correct?

Im planning on trying some Redline 15w40 with a donoaldson ELF7045 and going 10k miles with it. Im going to send out a sample of my 6k rotella t6 that I'm draining now then use the redline for 10k, drain then test the next batch at 10k if the engine seems to run ok with it. I know the ester oil can cause false numbers from cleaning softeft metal deposits so i wanted to wait.

 

I change oil in 5k and don't prefill filters in 30 years. Never had an engine failed. Only used dino oil with no additives.

Driven over a million miles.

Can't wait to see the responses on this.

 

I always changed my diesel oil every 5k, my last filter was black i just read the odometer i sharpied on there last oil change wrong and realized i was 1k over yesterday haha. I want to try the redline oil because of how great their driveline oils are but i want it to last 10k because its about $250 for oil

 

I pre oil the filter for my PSD's. I've heard from a guy I used to work with said not to because the oil isn't filtered. I'd rather not have the truck run for however long with no oil in it. How dirty is the oil in the bottle really? You're still pouring it in your truck. Just my $0.02.

Red

 

Prefiltered? Yea that's the part where the manufacturer refines and packages the oil.

Prefilling filter...ahh if it makes you sleep better do it...or don't.. I'm not loosing sleep either way.

 

I have always filled the filters and done 5k oil changes on all the fleets trucks on mine and the wife's Excursion with no side effects. You should hear a LQ4 (6.0) vortec, if you don't fill the filter first you hear a freaking sewing machine

 

Yeah i read it too but pouring into crankcase is it pumped into the filter first before bearings so that made sense to me, i just always thought oil was filtered first? i mean it does get poured over the lifters, cams and sometimes crank when filled on many vehicles, its just not pressurized to bearings in doing that.

My thinking was also there is a bypass in oil cooler to bypass unfiltered oil on cold start up anyway and that the thought with that is unfiltered oil is better than no oil which is my reasonining behind always filling filters. The less time your bearing surfaces are under oiled the longer the bearings should last.

always wet elements on everything, even fuel filters.

 

Oh yeah any LS series engine. Their hydraulic lifters can take up like .080" slack or something so they are loud when they arent pumped up

 

(Borrowed from the diesel stop) The Donaldson filter looks like it holds 2-3 quarts. Thats going to be alot of time to refill if i dont fill it first

 

I have always prefilled. Compared to what oil looks like when you change it, using it out of the bottle doesn't bother me. I prefer that over no oil

 

likewise 3v 5.4 will make your hart skip a beat...
I like to fill when I can..

 

Don't get me started with those stupid 3v 5.4 lol... I hate them just like the 6.dohs

 

As long as you change plugs every 30k and keep fixing timing chasing guides they ain't that bad till they shot a plug out. Lol

 

Oil from the manufacture is filtered better then your oil filter will.

 

I never did until I got the donaldson gaint filter!