For tranny flush, check your transmission fluid. Don't just blindly do it at a certain interval. How to check automatic fluid:
1. Start your car and bring it up to operating temperature
2. Run through your gears up and down
3. Pop the hood and pull out the tranny fluid dipstick
4. Wipe it down, reinsert and pull it out again. The fluid should be between the min and max markings
5. Check the colour. It should be pink. If it's dark or smells burnt, you need a fluid change.
As for oil, don't just go by distance, as dirt accumulates regardless of whether you drive or not. Just check it regularly and if it's dark or burnt then it needs a change.
Don't bother with an engine flush unless your oil changes have had substantial metal particles in them.
Coolant flush should be done every 5 years as that's the life of the antifreeze.
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