I did two 90K services on my '96 and '01 ES when I had them, and although these put a rather large dent on your wallet, they certainly help out when you plan to keep the ES for long-term. However, if you're handy with a few basic tools and some know-how, you could literally do half of the 90K service work by yourself and save lots of money, such as replacing the air filter, A/C filter, oil change, transmission fluid, etc.