I change it on my Solstice as often as the car tells me to which is around 8-10K miles. The only place you can really find it is at Pepboys and I think it's around 8-9 bucks a quart. It's probably cheaper if you buy it online.
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2008 Mysterious Solstice GXP - teh hotness!
2002 Pewter V6 Camaro M5 ~ SOLD 
mods: Gear, weight reduction, tuning
Fear the Gear. 13.585 @ 100.05 1.827
Beater: 93 Jeep Grand Cherokee
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