We have '98 Toyota with 100,000 miles on it, its a good truck, we depend upon it daily and intend on keeping it. Is it necessary to do all the shop recomended maintenance (timing belt, valves) at this time? We change the oil every 3,000 miles, and do a general check under the hood at that time. Any recomendations out there whether we should spend the money($1,000+) to keep it up by their standards or will it make 200,000 without it? Anybody have any dealings of this nature with their vehicle?