need a number to contact for a es300 engine replacment

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brought car for a local dealership here in arlington,texas which the dealer brought from a renter car com. in florida. i kept up with oil changes and other maintenace even drover car to south texas this past may 2010 no problems until last week 11-26-2010 the car stop on my wife while she was driven to work. car never started up since. had a cert.lexus mach.dign. and was determined that engine was badly maintain due from lack of oil changes. i do have my domon my oil changes so please help me with a number to asst. me with this repair iam on disabillity and can use what have cause i this love this car