ST cracked liner?

[0000]

The initial message was deleted from this topic on 26 June 2021 at 17:52

[Lumpyuk]

Coolant might just be a radiator leak? Would of thought the oil level would be increasing?

[checkmate91]

My '09 RS loses coolant too, from the nearside header on the radiator. It seeps out, gets soaked up by the sponge layer underneath the rad and on top of the lower support bracket and, I guess, evaporates off. Never seen a drop underneath. Leaky rad is a common fault among the RS/ST crowd. I've done 82k miles in mine so not too far behind you in mileage. Have you checked plugs/coils for cold start performance before assuming it's compression-related?