Also filed
In this issue
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Why a Car Battery Can Test 'Good' but Still Fail the Next Cold Morning
A battery's open-circuit voltage does not tell the whole story. Cold-cranking ability, state of charge, parasitic load and intermittent connections can create confusing results.
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The Oil Level Is Rising Instead of Falling: Why Some Diesels Can Dilute Engine Oil With Fuel
An oil level above the maximum mark can be more concerning than normal oil consumption. Repeated interrupted DPF regeneration is one possible route for diesel fuel to contaminate engine oil.
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Why a Diesel Car's Idle Speed Suddenly Rises: It May Be Regenerating the DPF
A slightly higher idle, cooling fan, hotter exhaust smell and changed start-stop behavior can coincide with active diesel particulate filter regeneration.