Compression Test -- 3.5L Engine Test Results
WARNING: This page is about a different car, the 2018 Ford Flex. However, it is still accessible from the selected car via links, so may be relevant.
The indicated compression pressures are considered within specification if the lowest reading cylinder is at least 75% of the highest reading. Refer to the Compression Pressure Limit Chart.
If one or more cylinders reads low, squirt approximately one tablespoon of engine oil meeting Ford specification on top of the pistons in the low-reading cylinders. Repeat the compression pressure check on these cylinders.