Hello guys, again Hello I’m new here and I got a good used 2008er with a complete checkbook from the dealer. My oil level shows me fully. I wanted to buy a liter of oil as a reserve for safety (that’s what I’ve been doing since driving cars). On the sign in the oil compartment it says that the PZ Regensburg took the Castrol Magnnatec Professional A3 5W-40 at the last service in 2014. I can no longer find this “only the Castrol Magnatec 5W-40 C3”. newer? The PZ told me that the A3 5W-40 is an older one and I should buy a 0W-40. I asked if I could combine a Magnatec with a Castrol Edge which could not tell me here again. What I found out is probably the specification number for Porsche “C3”. I know that now many say Castrol is not good etc. which I don’t care about because I stay with this brand. I’m now talking about: – Is the 5W-40 Magnatec C3 the successor of the in me in the Cayman used oil? – Can you combine the Magnatec which is currently in my Cayman with an edge? – Is the approval specification of the Cayman or in general of Porsche the identification C3? I hope it is someone who knows about it. Thank you guys PS: So far I had Audi there was the identification simply 507 etc… but now I am Porsche newbie