2009 F350 Will A Light Come On Indicating Dpf

No, Extended oil change intervals can negatively affect engine performance,
fuel economy and engine life. Refer to the engine oil specification chart
located under Engine oil specifications in the Maintenance and
Specifications chapter of this supplement.
On E-Series vehicles (6.0L engine), it is important to change the
engine oil at the recommended service intervals because oil viscosity is
important in maintaining the oil pressure required to actuate the fuel
injectors.
On F-Super Duty vehicles (6.4L engine), it is important to change
the engine oil at the recommended service intervals to maintain oil
viscosity with the addition of the diesel particulate filter (DPF). DIESEL EXHAUST SYSTEM: OXIDATION CATALYST/DIESEL
PARTICULATE FILTER SYSTEM (F-SUPER DUTY ONLY)
Your vehicle is equipped with a diesel particulate filter (DPF), which is
coupled to a diesel oxidation catalyst, that reduces the amount of
harmful exhaust emitted from the tailpipe. As soot gathers in the system
it begins to restrict the filter. The soot gathered inside the filter needs to
be periodically cleaned. The soot can be cleaned in two different ways;
passive regeneration and active regeneration. Both methods occur
automatically and require no actions from the driver/operator. During
either one of these regeneration methods you may notice an
increase/change in exhaust noise/tone and increased engine idle speed.

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