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Q: Tarazza transmission fluid change
on 2006 Buick Terraza

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
You recommend chnging transmision fluid every 30,000 miles. Owner's manual recommends every 100,000 unless used under harsh conditions.
(1) Answer
I would follow the manufactures schedule. This is what the vehicle engineers have set as the interval. Harsh conditions would be towing, lots of hills, conditions like this.
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