Why not use the same interval you used on the last 2-3 cars you've
Typically, Owners Manual's don't say anything about brake fluid changes.
Most drivers never do them.
I'm not sure if the 5 years / 150,000 miles change interval on
Transmission & Radiator fluid was in effect in 2002. That the interval
for 2005 Buicks.
Does your car have an Oil Life monitor? If not, The 3 Months / 3000
miles interval is highly recommended.
How clean is your oil after 3000 miles? You may be able to go longer.
05 Park Avenue 55,355 mi.
91 Bonneville 309,423 mi.