two hoots

I have just up graded from an IS 220d SEL to an RX400h SR. Can anyone tell me what the difference is between the SR and the SE I can't seem to be able to find out what the difference is. I have just bought this car on a 57 plate with 41,000 on the clock. The original owner ordered it with the Multi Media Pack, seems a great addition otherwise it's standard

Dear lenore, As far as I am aware the 3.3 litre V6 engine is a chain cam engine and that there are no rubber timing belts to change.