75,000 mile service

look up maintenance intervals for your car in your owners manual or on the computer

absolutely do not replace plugs or the Timing belt. Wait until around 110,000 miles before you replace plugs or timing belt. Your local mechanic will be able to tell you exactly when you should change your plugs and timing belt. The Lexus is a well engineered car and you should expect flawless performance for many years. You need to be using a Fuel Additive preferably SEA FOAM engine/injector cleaner at least one Can every 3rd fill up just add one can to your Tank during fill Up. You will notice your car performance to improve along with your fuel economy. Also check your air filter regularly and keep it blown out with an Air Hose, it is not necessary to replace it with every Oil change. You can also upgrade your air filter with a K & N oiled air filter this will improve Air Flow and increase your MPG

Spark plugs are supposed to be 60,000 miles. Timing belt is at 90,000 miles. Once you do both, then you can "start the timer" again for another 60,000 or 90,000 miles. Because you might not use the car for another 8years/75,000miles, might as well do it now as a "mid-life refresh". Do it now and you'll be set for the remaining life of the car, even though the parts might not be 100% used up.