I'm a newbie to this - having low oil pressure in 2000 Porsche C4 and would like to replace the oil pressure relief parts - have them on order from pelican but...planning ahead, I looked under car from rear and think I found the plug on the left (drivers) side almost even with Rear wheel. Brass plug - my manual says it should be a M18 but it looks much larger than that (M28?). So I'm not sure I have the correct location. Can someone send me a picture of the location for this plug?
Thanks
gmorris552