FixVault

No. 16 High Oil Consumption/Leakage

WARNING: This page is about a different car, the 2004 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Possible Cause - No. 16 High Oil Consumption/Leakage
G01345571Courtesy of MAZDA MOTORS CORP.

Diagnostic Procedure 

Fig 2: Diagnostic Procedure - No. 16 High Oil Consumption/Leakage
G01345572Courtesy of MAZDA MOTORS CORP.