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AV-SCANNER / Service function guides / Engine and oil

Service function guideOil Leak Tracing

This guide gives working mechanics and experienced DIYers a complete, methodical procedure for tracing an engine oil leak to its true source rather than the lowest drip point. It covers how the lubrication and ventilation systems behave under load, how to prepare a vehicle for clean inspection, and how to use dye, pressure, and airflow testing to isolate the origin. Readers will finish able to distinguish a gasket seep from a seal failure, a rear main leak from a bellhousing contamination, and a pressure-driven leak from a gravity drip, then verify the repair with a documented recheck.

CategoryEngine and oil
DifficultyProfessional
Time needed2 to 4 hours
Length12 sections

Guidance is general and covers many makes. Exact procedures and values vary by model, so confirm them in the factory service information for your vehicle.

Keep the full guide

Download all 12 sections as a branded PDF to use in the workshop.

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