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    2015 GTI (Modded) 5k unknown oil

    Hey all, long time lurker, new poster. Did a UOA on my 2015 GTI I recently purchased. I believe it to be Castrol 0W-40. Car is Tuned stage 1 plus by Unitronic and is full bolt on Will be using Mobil 1 0W-40 FS like I have on my past 4 VW's and 2 Saabs at 5K OCI <a...