I noticed that my Z burns a bit of oil but seems to be getting better like stated above
1st ever oil change done at 1500 miles = oil came out nasty and only ~3.8qts came out...filled with Amsoil synthetic.
2nd oil change at 5000 miles = oil came out pretty dark, got about 4.3qts out this time
Currently car is at 7500 miles and just added .2 qt yesterday to top off to proper level.
So, based on the burn rate it seems to be improving. Going from a full quart to what I expect will end up about .4 qt by the time my next oil change comes around at ~10k miles.
Based on this improvement, it should stop burning completely by right around the 15k oil change, like Kenchan stated above ^^
Mine might take until 20k, I've not babied it
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