My 2012 Toyta Rav4 just turned 100K miles and I took it to the dealer for an oil change and inspection. They said everything looked on the car but it needed a few things:
Transmission fluid changed
Fuel system cleaned
Oil system flushed
Coolant sytem flushed
Brake system flushed
To flush or clean these five things they wanted a thousand bucks. I'm all about good maintenance but are any of these things fairly easy to do myself. Can I change the tranny fluid myself and put some Lucas in the gas tank to clean the injectors? How about the coolant, can I drain the radiator and add new water and anti-freeze?
1) Transmission: Assuming yours is auto, transmissions do well to have the fluid drained and replaced every 30K miles; if you've gotten to 100K not servicing it, leave it alone -- you're more apt to break sludge loose and cause a failure than do any good at this point. Leave it be; unserviced auto trannies generally go sometime after 100k to 120k anyway.
2) Fuel system: unless you've regularly been using off-brand crud fuel available only in rural Paraguay, you don't need to clean the fuel system -- modern, quality gasoline with proprietary detergents take care of this each time you fuel up. If anything, vary which gas providers you use to get different detergent combinations into your fuel system for potentially better results.
3) Oil system flushing is absurd; a proper oil change "flushes" the oil system, especially if you do it regularly like you're supposed to. Slick oil additives to high mileage cars usually do more harm to the seals than good to the engine.
4) Coolant system should be drained and filled with fresh coolant specified to your vehicle every two to four years.
5) Brake fluid ditto but every one to two years.
These are proactive suggestions, but will serve you well for long term ownership. You can do it yourself if you do the research to make certain you know what you're doing, have the right tools and equipment, and quality fluids. A good Rav4 forum will have do-it-yourself tutorials.
As for flushes -- don't do 'em. They're high-pressure, machine impelled swap-outs that make the dealer's life easier (and richer) but are arguably not good for the engine for a variety of reasons.
A good mechanic will understand if you prefer drains and refills and take care of it for you if you decide not to go the do-it-yourself route. If so, find a qualified independent mechanic well-trained in your kind of vehicle.
Good luck.
