Hi all, hope I'm posting in the right place? I have posted previously about my first Subaru wrx 2.5 07 plate. Bought end of September. Only had it 2 weeks before it went back for head gaskets!! Got it back after 2 weeks and a supposed full rebuild. Okay until December when just routinely decided to check oil and the dipstick was dry! Took almost full 5 litres to get back to full mark, all this after only doing about 500 miles since the rebuild. Phoned the garage back up and to be fair they were okay about it and said to take car back. Now it is a bit of a trek back to where I bought it so asked if I could take it to a local garage for their opinion as its still under warranty. Actually took it to a couple. Both said fill it up and run it keeping an eye on oil level. One said they may have forgot to fill it up when they fixed it. Find that hard to believe. Anyway, been checking it regularly and noticed it going down again, to the point where its nearly all gone after only 500 miles. There is no visible oil leak or patch where its parked and no smoke coming from exhaust. What should the garage be checking for?? Love the car but is it time to give the keys back and buy another.