Fluorescent Oil Additive Method

NOTE: When diagnosing engine oil leaks, the source and location of the leak must be positively identified prior to service.

Prior to performing this procedure, clean the cylinder block, cylinder heads, valve covers, oil pan, and flywheel with a suitable solvent to remove all traces of oil.
1. Clean engine with a suitable solvent to remove all traces of oil.
2. Drain the engine oil crankcase and refill it with recommended oil, premixed with Diesel Engine Oil Dye 164-R3705 meeting Ford specification ESE-M99C 103-B1 or equivalent. Use a minimum of 14.8 ml (0.5 ounce) to a maximum of 29.6 ml (1 ounce) of fluorescent additive to all engines If the oil is not premixed, fluorescent additive must first be added to the crankcase.
3. Run the engine for 15 minutes. Stop the engine and inspect all the seal and gasket areas for leaks with 12 Volt Master UV Diagnostic Inspection Kits. A clear, bright yellow or orange area will identify the leak. For extremely small leaks, several hours may be required for the leak to appear.
4. If necessary, pressurize the main oil gallery system to locate leaks due to improperly sealed, loose, or cocked plugs. If the flywheel bolts leak oil, look for sealer on the threads.
5. Repair all leaks as required.