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Loosing oil and compression

  Rally Clio N3 Mk2
Hi, well my 172 suddenly started loosing oil but theres no oil puddles nor any indication of leakage, today they tested the compression and apparently 2 pistons are a little low, 2 are running at 130, other 120 and another at 110, i doesnt look like much but im not very familiar with compression numbers.

The car doesnt emit blue smoke or anything, but i still think its a partially damaged piston ring, maybe just the bottom one and its burning oil, any ideas of what else it could be?
  Rally Clio N3 Mk2
no help? i guess we are opening the engine now to find out if its either a pistong ring or oil leaking from the valve seals