marcoturbo

And it's also easier to remove than the OC142-stock 944 unit.

DFASTEST951

"And it's also easier to remove than the OC142-stock 944 unit"

You got that right. Even easier with the headlights up...

By the way, anyone ever hear of a CM RACING FILTER? Read a bit on them. Then never seen them again. Anyone?

420WHP944

[QUOTE=DFASTEST951

By the way, anyone ever hear of a CM RACING FILTER? Read a bit on them. Then never seen them again. Anyone?[/QUOTE]

I recently installed a CM racing filter, mainly due to the fact it filters down to 8 microns which is supposedly twice that of conventional filters, it also filters ALL the oil ALL the time, no bypass in it for heavy surges, I like that idea also...

andrew at www.promaxmotorsport.com has them, thats where I got mine...

theedge

Drainback flap craps out after 1000 miles or so, so you get nice lovely dry starts.

OriginalSterm

mahle

had a problem with the oil light coming on if starting hot for some reason when i went with an el cheapo purolator filter.

Musche

Interesting....I've used Mahle OC-142. I had ordered some stuff from Lindsey a while back and I ordered an oil filter since I knew I would changing oil soon. They shipped me a Mahle OC-75 (for 911's). I called and asked if this was wrong and I was told this is the filter they always use. It looks the same but is a bit taller. Anyone have any issues with this?

DFASTEST951

theedge, are you talking about the 828 filters or the CM Racing ones?
Musche, I believe the filter you got from Lindsey is the same idea as to why you can use the 928 filters. Same but taller.
420whp, That's exactly why I wanted to try the CM. Filtration down to 8 microns. I'm glad someone here knows about them. I've read about them and then never found a vendor. Tell me more about your experience with them...

cruise98

The purolater is a great filter. The factory filters used to be made by them. I have used them, and the one on my car at the moment is a factory purolator.

I have a Canton Mecca filter also, but think it is better suited to a race car or one equipped with an accusump. Racer Parts Wholesale and Pegasus Auto Racing both carry them. The "anti-drain back valve" is just a rubber washer. It lasts longer than 1,000 miles but is not as effective as the factory style anti-drain back valve. It sure makes filter changes clean though.

DFASTEST951

That brings up a good point. Does the "anti drain valve" make oil changes messier or cleaner. That said, any tips on getting the oil out of the filter before it comes off and oil drips everywhere?

washington951

i had a CM filter on mine for one oil change - then i read about the drainback valve problems and took it off the change. it seemed fine when i chucked it in the trash....

420WHP944

Joe,
It's only been 200 odd miles since I've fitted the CM filter, I've heard by some on this board that the anti drainback valve can fail after a 1000 miles or so, I'm waiting to see if thats the case with mine.

one thing for sure is the filtration is excellent and i'm looking for the best protection possible for my newly built engine, you can also unscrew the top of the CM filter to replace the cartridge without the mess you get with standard filters. I'll be watching to make sure my oil pressure pegs quickly everytime I start my car so I know the drainback valve is working normally, after that all that can be said is its a great filter for our cars with outstanding filtration....thats the main reason why I'm using it.....I want the best protection for my engine

zerMATT951

Just curious - what's typical for oil pressure jumping on startup? Is about one second typical? How many seconds means your drainback valve is not working properly?

Gator_86_951

mahle
w3rd

HIGHBOOST

This may be a dumb question, but what is the purpose of the drainback valve?

zerMATT951

The drainback valve (aka anti-drainback valve) keeps oil in the filter after the engine has been turned off. Oil retined in the filter reduces the amount of time it takes for oil pressure to build when starting the engine, making lubrication start sooner. It's necessary when oil filters are mounted "threads down" like on our cars. Other cars, like Chevy small blocks wouldn't need an anti-drainback valve because their filters are mounted "threads up", so the filter stays full after the engine has been stopped.