PF-25 Oil Filter Revelation

[John H.]

Re: PF-25 Oil Filter Revelation

John Hinckley once posted about the oil they put in for "hot firing" the engine at Flint (and I presume Tonawanda). They filled the engines with oil from a reservoir. When the "hot fire test" was complete they drained the oil into a sump in the floor. That sump was connected to the same reservoir that the oil fill came from. How clean do you think that recycled (today we would call it "green") oil was?

Terry -

That recirculating drain oil system had a pretty sophisticated bulk filtration system that was specified by Engineering, and the oil in the system was automatically replenished with new oil; 300 new engines every hour put a fair amount of machining residue into the drain sumps, and a fair amount of oil went out the door every hour, clinging to all the internals after hot-test.

[Joe L.]

Re: PF-25 Oil Filter Revelation

I also remember back in the day maybe not Corvette folk but many people changed their oil but not the filter that was changed every other oil change.

Paul 18046

Paul-----


That practice is still specified in many owner's manuals for current-day cars.

[Joe L.]

Re: PF-25 Oil Filter Revelation

One other thing that I should have mentioned and made clear is this: while we have 2 "data points" regarding oil filter silk screening, those both apply to the 1970 model year. As I mentioned, I'm confident that what we see on the Camaros would also apply to Corvettes. However, that would be limited to the 1970 model year or some portion of it. We cannot "extrapolate" to the 1969 model year, the 1971 model year, or any other model year. Most likely, the silk-screening practice would have been the same for the other years but not necessarily so. The spin-on oil filter was, basically, in its infancy in the late 60's. While it had been used for some 6 cylinder applications since the early 60's, widespread use did not occur until the late 60's. Then, for example, it's possible that for 1968 and 1969, the PRODUCTION and SERVICE oil filters were identical. Then, someone could have gotten the bright idea that somehow differentiating them would be useful or cost efficient.

The long and the short of it is this: I do not consider that we're anywhere near establishing new judging standards for 68-72 oil filters. Likely, we'll never get there.

[Kenneth H.]

Re: PF-25 Oil Filter Revelation

Just found this over on the Yenko site. It's from 2003. Mark, you posted on the thread, and Joe ("Loe Lucia") you're referenced in the first post. Again, the pictures are of a supposed original PF25 filter on a Camaro.

http://www.yenko.net/ubbthreads/ubbthreads.php?ubb=showflat&Number=406495

Thanks

[Kenneth H.]

Re: PF-25 Oil Filter Revelation

Just found this over on the Yenko site. It's from 2003. Mark, you posted on the thread, and Joe ("Loe Lucia") you're referenced in the first post. Again, the pictures are of a supposed original PF25 filter on a Camaro.

http://www.yenko.net/ubbthreads/ubbt...&Number=406495

Thanks

[Terry M.]

Re: PF-25 Oil Filter Revelation

Just found this over on the Yenko site. It's from 2003. Mark, you posted on the thread, and Joe ("Loe Lucia") you're referenced in the first post. Again, the pictures are of a supposed original PF25 filter on a Camaro.

http://www.yenko.net/ubbthreads/ubbthreads.php?ubb=showflat&Number=406495

Thanks

Small world, isn't it?

[Mark D.]

Re: PF-25 Oil Filter Revelation

This from Don Stowers on the Yenko site regarding a 500 mile 70 Camaro he owned:

Rick, this filter was removed from a 1970 L-78 Camaro that showed 500 miles on the odometer.I personally took it off the engine in 1988.A friend of mine had bought the car which had been converted to a race car.The L-78 had been removed when new and replaced with a L-88.I replaced all the race parts with the stock original parts which had all been saved.The oil filter was removed as we had the engine disassembled cleaned and re-assembled.The oil filter was stuck so tight that the only way I could get it off was with a punch through the body and a hammer.This was prior to the time when replacing an oil filter was not a big deal.If I only knew then.......................

Take note of the embossed wording on the bottom of the filter.Air filters weren't the only ones with this verbiage.
Don

[Terry M.]

Re: PF-25 Oil Filter Revelation

That makes number 3.

[Mark D.]

Re: PF-25 Oil Filter Revelation

I'm thinking Joe and Terry are onto something and would have very little trouble falling in line here. It would be greater than great if Joe's buddy with the original Corvette were to step forward with a black silk screened example. I would get out the orchestra conductor's baton and start leading the charge.

Joe's initial opinion is very compelling.

[Stan F.]

Re: PF-25 Oil Filter Revelation

We've been discussing this with regard to the 1970-1972 manual revision.

The filter below came from a 1970 Nova with 6,000 miles.

Service replacement on the left, production 1970 Nova PF-25 on the right.









I have been told by the gentleman who removed this filter that he has seen others like it on original cars... This is not unique.

Regards,

Stan Falenski

[Ronald L.]

Re: PF-25 Oil Filter Revelation

That filter shown on ebay link is a Canadian version, never made in the USA.


Where is our resident AC Oil filter guy in this, is he still around?