don0301 wrote: ↑Wed Aug 26, 2020 12:01 pm
Every Castrol Edge 5W30 I've bought in the UK has been 504...
Like I said, listen to "random bloke" on the internet, what could go wrong? Like you repeatedly mentioning 505 even when it's been pointed out to you it's for DIESEL engines....
Well, hang on. If you want to poke at my internet sleuthing skills, let's hear your reasoning in return. Did you actually look at any of the links I posted? In them, people say things like "It is recommended to use a 505 01
diesel spec oil to offer RS6 engines better high heat stability and protection." and "RS6 requires VW 505.01". In my manual, there is no RS6-specific section, so considering the A6 and S6 engines are completely different, I don't think it's necessarily valid to read into that too much. So, weak as it may be, my logic is backed up by the above posts. What exactly are you using as reasoning to support your 504 claim? Please post some logic, whether it be a reference to the manual, or Audi spec sheets, or at least something besides "I've been using it for many years", I'd be very happy to hear it as I obviously posted this thread looking for advice, rather than criticism.
[edit] and btw, just saying "Castrol Edge 5W30" is inconclusive. There is Castrol Edge 5W30 LL (which is 504), A3/B4 (502.00 and 505.00), FE (nothing), SN (nothing), US (American standards), etc. So yeah, just saying, even referencing a manual saying "Castrol Edge" as if it were gospel would not be exactly helpful.