When mine went last year (D2 V8), we'd just done a 600km mostly highway drive back to Brisbane. No issues, nothing noticed and i usually take note if something seems slightly off. Left it for two days. Then starting up it didnt seem quite right. Next day same again, driven about 5km pulling into a (busy) driveway and it died outright. It had done about 142k km at the time. No idea whether it had been changed before or not. Would consider changing again, to pre empt another debarcle but it wasnt cheap. Think it was about $150 for the part an same for fitting. But could be worth changing, just have to decide when...? 200k km ?

