our 07 hit 100k miles so I changed the plugs found 2 where the coils had oil on them. sucked out the oil and changed the plugs. Ran great started quick up to 23 mpg (averaged 21 before) A week later checked oil half a quart low. week later whole quart low 3 weeks later again a quart low. Didnt see it burning at all. Anyone else have this issue??