I'm told that my 2007 EOS needs a very expensive change of transmission fluid (I have the tiptronic transmission) for "routine maintenance" at 45,000 miles. What is the liklihood that I will have problems without it, and can I go longer than 45,000?.

Transmission services are part of routine maintenence. Flushing the system on a high mileage vehicle where the fluid has been neglected can cause issues as it stirs up and removes deposits of varnish and worn band/clutch debris through out the system. Most vehicles are usually drain and fill. Others are pan removal with filter and fluid change. Not many companies still do "flushes" but will recommend one of the above services be performed during routine maintenence

Routine maintenance items mainly include oil and oil filter, air filter , fuel filter and pollen filter replacement , spark plug maintenance / replacement , gearbox oil -related system checks and maintenance projects.
In addition, brake fluid, transmission fluid , battery , throttle , diagnostic tool , brakes and other components, when they belong in the regular maintenance of the test items , depending on usage Maintenance .

the maintenance schedule is in the owners manual on the last 2 pages I believe, But here are some of the things to check the maintenance schedule on that car calls for oil changes every 3,750 miles if you primarily use the car around town or 7,500 if you do mostly highway driving without stop and go traffic. Most cars should go by the 3,750 schedule.

tire rotations should be every 7,500 miles. Brakes should be checked when the tires are rotated.

the major service on the 4 cylinder is every 30,000 miles. that includes the tune-up items of replacing spark plugs, adjusting the valves, replacing the air filter, transmission fluid, interior cabin filter and the inspections and adjustments.

the 6 cylinder does not need the valve adjustment or spark plug replacement until 105,000 miles. otherwise, the fluids and filter replacements are every 30k.

the timing belt on both the 4 cyl and the 6 cyl is 105,000. at that time the water pump and coolant are also replaced as well as the other accessory drive belts.

Brake fluid should be replaced every 3 years or 45,000 miles.

engine oil,every 3to 5 thousand miles depending on what weight oil and brand of oil. transmission fluid, every 45,000 miles 4 wheel drive? change the gear oil in transfer case also every 45,000 miles but i like to insure my vehicles are properly lubed as they are my service trucks also.

It is imperative you use the correct fluid in your Audi tiptronic transmission. Look in your owners manual for the correct fluid. If you do not have an owners manual call your local Audi dealer or better yet drive to one and purchase Audi Pentosin A/T fluid from the dealer. Do not use Dexron III as it is not designed for the Triptonic transmission. A transmission is very expensive to replace so do not take any chances and just buy your fluid from your Audi dealer even though you may pay a little more. That way you are 100% sure you are using the correct fluid.

This is a oil change reminder. Nothing fancy about, when you get your oil change go into the menu and click reset counter and it will go off. If there was something wrong with your car the check engine light would come on.

check your owners manual, i bet they recommend a new belt, rad fluid, brake fluid , and other services, follow that guideline

Use sludge protectant oils and change transmission fluid often. Do all the maintenance on time or before. Like differential fluids and etc. look in your service manual on what to do and do it in time.

The tiptronic is not the DSG - two separate transmissions. You don't need to service the tiptronic every 40k like you do the DSG.
VW considers the fluid in a Tiptronic tranny as "lifetime" fluid - it doesn't need to be changed.

I would change transmission fluid and differential fluids. check to see if it has a fuel filter also I know they stopped putting an inline filter somewhere around your year model and just has one in tank that doesnt have to be changed. you can also change air filter and inside cabin air filter located behind glove box . The spark plugs are platinum good for 100,000 then tune up needs to be done. plugs and wires, use only ac delco platinum plugs and ac delco wires. a little more expensive but way better to me than the others. they have coil packs so there is no distributor cap or button to replace.