Just wanted to chime in here in case it’s any help to anyone. My 2017 1.4 tsi Kodiaq registered in the UK in Sept 2017 says in the owners manual that the recommended oil for variable servicing is 508 00 (504 00 optional) as it seems to be the case for all 1.4 owners.
I’m starting my own servicing this year, so I rang the dealer to see what oil was used during last 2 services. They said OW30, which was a surprise to me as I would have expected a 502 spec oil as recommended in the owners manual for the fixed term annual services that the car was set for.
I called a second dealer to find out what they’d recommend if switching to variable service since the car doesn’t do a lot of miles. They looked it up by the reg and said 504 00 0w30 is the recommended oil. They believed 508 00 is for the 2020 models and higher.
What I find misleading is that VAG recommend 508 00 in the owners manual for 1.4 tsi engines, and the 1.4 tsi kodiaq was only manufactured up to 2018.
I still want to believe 508 00 is the correct oil as stated in the owners manual but I’ll play it safe with a 504 spec since it’s what the dealers are recommending.