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September 21, 2018 Service bulletin

Oil residue on the engine front cover from seepage around the joint portion (A) between the cylinder block...

Mazda technical service bulletin 01-018-18-3529 for 2014-2017 Mazda MAZDA3, 2013-2016 Mazda CX-5 and 2014-2017 Mazda MAZDA6.

Bulletin number
01-018-18-3529
Component
Engine
Summary
Some vehicles may exhibit oil residue on the engine front cover from seepage around the joint portion (A) between the cylinder block and head. It becomes very noticable with dust adhesion. In some cases, the area of oil residue extends down to around the joint portion (B) between the engine front cover and the oil pan. This may be caused by oil escaping from a fine clearance created at the sealant applied to joint (A) between the cylinder block (B) and head (C) when the engine was pressurized during leak testing on the engine assembly line.

Owners of these vehicles have filed 198 complaints in the engine category.

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