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Kevin D · Joined: 28 Jul 2005 Posts: 152 Location: Boise, ID

OK - So I got my Koni replacement cartridges and the instructions say to add 50cc of oil.
2 questions:
Any particular type and weight of oil?
What is the seal part number?

I can't find any mention of a seal to fit over the cartridge and under the cap. It sure doesn't seem to be a tight enough fit to keep the oil in the tubes without some sort of seal. I guess I could just squeeze a tube of rtv around the top of the cartridge before I put the cap on.

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'88 924S 3L 6sp RedRat
'92 Duc 900ss
'02 Duc 998 Carbon
'72 RD 350

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

I use ATF in my struts. No need to worry about leakage. . .the insert fits quite tightly in the housing when torqued down.

Oh, and 50cc is way too much. Put a splash in, slip in the insert until it is almost bottomed out, and dribble ATF down the side. Put some in, bottom the insert. Repeat until ATF spooges out. Done!
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

Kevin D · Joined: 28 Jul 2005 Posts: 152 Location: Boise, ID

Thanks Rasta. Gonna have her ready for the meet!
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'88 924S 3L 6sp RedRat
'92 Duc 900ss
'02 Duc 998 Carbon
'72 RD 350

!tom · Posted: Wed Jun 12, 2013 3:56 pm Post subject:

The purpose of this oil is to conduct the heat generated in the damper to the strut housing so that it can be dissipated into the air.

So, any fluid that is non-corrosive will do. ATF would be easy to work with because it's thin, but motorcycle fork oil would do nicely as well. There isn't even a need for it to be fresh oil, although I'd have a hard time putting really nasty stuff in. . .

No seals are needed because gravity holds the oil down, and there's no pressure to build up in the strut housing.
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78 924 NA
5-lug

Kevin D · Joined: 28 Jul 2005 Posts: 152 Location: Boise, ID

Thanks for the suggestion on fork oil.
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'88 924S 3L 6sp RedRat
'92 Duc 900ss
'02 Duc 998 Carbon
'72 RD 350

Paul · Posted: Thu Jun 13, 2013 10:30 am Post subject:

I've always used the oil that was in the strut.
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White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.