pp000830

I was looking at my 993 and thinking gee why like no earlier 911 engine there are two oil filters. I was theorizing it was because of the extended service intervals for the filters and oil. Then the idea struck me... If one changes their oil once a year or so with an interval of 5000 miles does the engine even benefit from the little 2nd filter. If it was replaced with a pass through cap oil changes on the 993 would be a snap and could be accomplished in half the time and no nasty chassis drips to clean up!

Any thoughts on this?

Andy

Does anyone make a pass through cap?

race911

No hydraulic lifters before the 993. Also, you had the engine mounted oil cooler in that spot on pre-3.6L. Note the 964 Turbo also has a second oil filter, but I've never searched for or heard of an explanation--never owned one, and only serviced a couple back when they were new cars.

And, you can go here too look at what was mounted to the 906/910/various 911 racers in lieu of the engine mounted cooler: http://www.pbase.com/9146gt/image/34396340

Quadcammer

If you're too lazy to replace that second filter, which is really not that hard or messy, you're a hack.

KNS

I think I read somewhere that Porsche wanted to make certain that the oil was especially clean for the lifters - no lifters on the 3.6 of the 964 but they only have one filter like the earlier 911s.

OverBoosted28

You mean no "hydraulic" lifters.....

911PERVY

You sure about the 965? Hope there is no one in here with a car you serviced!

ble2011

Why would you want to bypass an oil filter? It's not expensive to replace or hard to do. The downside could be irreversible to the harm it would cause.

EMBPilot

Which is why quad is staunchly against changing either of them. He just adds oil.

Quadcammer

wait, you mean the thing needs oil?

I thought that clacking sound was normal

AOW162435

^ This right here.



Andreas

cgfen

I think this pass through is a fundamentally bad idea.
Ps most oil filters already do have pass through function, but that's not a good scenario.

Sorry can't answer the why question other than likely carryover from earlier design.

1990-964

While I agree that deleting the small engine filter is not a good idea, I have thought that it might be nice to remote mount it to allow easy access. Not sure where is move it to though.

PRSWILL

I think it's great that they "over-engineered" this! I get an oil change annually for $ 175 bucks- at almost 10 bucks quart for Mobile 1 and 2 filters- that's a steal!

race911

'Splain console 930 107 057 01 (#44) and filter 944 107 201 03 (#48)?

It WAS something that just popped in my head as I was typing that response.

(And I'll stand by almost 35 years of dealing with these things, as well as what I remember as a pretty satisfied customer base when I ran my shops.)

race911

Even found a photo, via Streather's book and someone he credited (right side of engine photo, Page 8): http://www.adrianstreather.com/docs/...20overview.pdf