Help, i've recently bought an astra 1.4i ls ac, 02 reg and have just noticed when i turn on the ignition insp displays where the trip counter is, stays on for about 7 seconds then reverts back to trip meter, the next service is not due for 16,000 miles/ 9 months. no other warning lights stay on. should i worry about this or just ignore it. The car was bought from a vauxhall dealer and sreviced by them prior to my collecting it. Any comments appreciated.