I have a 2001 corolla and a mystery, it runs very nicely and I would be confident on any journey, BUT , oil disappears , eg I went to Newquay last year and before I started the return trip I checked oil and it was empty ,not a surprise, I filled it up to max level , after exactly 100 miles we stopped at services to feed grandson, after cool off period I checked oil and it was totally empty , filled up again and carried on trip, after another 200 miles arrived home and after cool off period checked oil it, hadn,t used a drop . this happens frequently , it doesn,t smoke , there is no oil over engine, doesn,t smell of burning oil, there is none on garage floor, it runs absolutely beautifully. keep thinking of replacing it but like I said earlier I am confident that it would take me anywhere. I have asked at my local garage and he has no idea . anyone out there with a suggestion.