Diesel Engines Engine
Oil Dilution Calculation
• The PCM calculates the oil dilution amount based on the duration of the regeneration
process and the regeneration intervals.
• If the engine oil level reaches a certain limit due to oil dilution, DTC P252F is stored in
the PCM but no warning light is illuminated. This DTC (Diagnostic Trouble Code) comes
up when the regeneration of the DPF has been started multiple times but could never be
completed due to the driving method (such as frequent short distance driving with low
engine speed etc.). In this case, check the engine oil level. If the oil level is lower than
the “X” mark on the dipstick, delete the DTC. In addition, the customer must be informed
to change the driving method (such as driving the vehicle at middle or high engine
speeds for a longer distance), so that regeneration of the DPF is enabled.
• If the engine oil performance and engine oil level is approaching the limit due to oil
dilution, the DPF indicator light flashes and DTC P253F is stored in the PCM. In addition,
the PCM reduces the fuel injection amount to protect the engine. However, the engine
could be damaged if the vehicle continues to be driven. In this case, replace the engine
oil even if the engine oil level is lower than the “X” mark on the dipstick. In addition, the
customer must be informed to change the driving method (such as driving the vehicle at
middle or high engine speeds for a longer distance), so that regeneration of the DPF is
enabled.
01-36 Service Training Mazda6 Facelift
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