oils using very low viscosities burn off faster, 0 W's are the worse, but as mola noted a 5 W is a big improvement. girlfriends 13 malibu LS 2.5 direct injected engine was drinking the dexos spec 5-20 oil changed to 10-30 + all was well, for a while anyway, now at almost 60 thou its getting worse so using a 5-40 so far so good!!! all oils were fake synthetic group III's as far as i know!