The 18R is a 2 liter engine, not a 1.6L. Either ways, there is enough support for the 18R engine, you can rebuild it in maybe under 20,000 Rs with new parts. It's a good torquey engine, with good fuel economy, very robust. Oh yea, and there's nothing as a Mark I. This is an RT85 Corona, and is reconditioned as it bears the Toyopet name. Teq cars were brand new Japan imports, Toyopets were reconditioned.