OIL ANALYSIS KIT AVIATION LABS Metal Check Metal Check Oil Analysis Kit is used for determination of the condition of oil wetted engine parts. Analysis is complete in 24 hours and excellent for pre-purchase inspection. Abnormal results communicated immediately. Analysis is not applicable for hydraulic fluid. Aviation Laboratories has the largest results database for every engine model resulting in the development of accurate interpretive guidelines. With experienced analytical staff AV Labs kit is recommended or authorized by most engine manufacturers.