Power Transfer Unit (PTU) oil leak on AWD carsmoderate
- 3.5L Ti-VCT V6
- 2.3L EcoBoost I4
All-wheel-drive 2018s carry the same PTU leak as the rest of the generation: the pinion seal weeps oil at modest mileage, the sealed-for-life fluid overheats, and the unit can fail — a job a shop mechanic says he has done 'over 20' times. The fix that heads it off is a fluid change every 15,000-20,000 miles with a fresh drain plug. Look underneath for oil around the PTU and ask about service history.
Sources: NHTSA complaint database, 2018 Ford Explorer · NHTSA manufacturer communications (CSP 20N07/20B27, 19N05) + independent gen-5 Explorer mechanic transcripts
a few hundred
PTU fluid service (preventive)
$1,000+, directional
PTU replacement (≈6 hrs labor)