Porsche oil leak

[Ray Dupree]

My 1969, 911, after driving has an oil leak from under the oil tank. The leak drops from directly under the tank. Some time a small amount, and some time the size of about six inches round.

It started after an oil change, but is not coming from the filter. It's a very slow leak. I will pull the tank next week, clean it up and check all connections. I did fill the tank to recommended amount.


Any ideas.


Thanks.

[Tidybuoy]

Since it started after an oil change, my guess would be that "new" crush washers were not used to seal the plug.

[Targalid]

I am sure you tank needs reconditioning after so many years but a short term diagnosis would involve taking the car to a car wash. Use the high pressure hose to clean the gunk off the outside of the tank so you can spot any leaks, dry the tank thoroughly with a rag and then watch it to see where the oil appears. I suspect that Tidybuoy is correct about the crush washer, a 25 cent part. The other place the tank commonly leaks is at the oil level sender gasket, high up on the outside of the oil tank.

[redstrosekNic]

+1 on checking the washer on the drain plug. Make sure the plug is torqued correctly.

[Socbum]

Did you switch to synthetic oil with this oil change?

[advtracing]

plus 1 on the tank bung / crush washer . i am having no end of issues trying to get mine to seal even with the right torque . i may add a fibre washer

[advtracing]

Update and fix, with a exhust swamp amd backdate just done, I tried again with a new bug and this have no good result , so just put 2 crush washers on and torqued it up . Perfect no leaks at all

[Ramathorn]

only one leak? consider yourself lucky, lol.

[NeedSpace]

Wait, these porsche's leak oil?