In some cases just filter it can be used as in tractors in agriculture by small modifications in the engines.

The cooking oil has a high content of FAA, for that reason is difficult to use it as raw material for the biodiesel production with NaOH. The most economical way for converting cooking oil to usable raw material for biodiesel production is to filter the cooking oil and make an acid reaction with methanol, using H2SO4 as the catalyst. This reaction reduces the FAA content.

the best is the sequence of esterification/transesterification by the use of an adequate technology (such as our Co-Sol) to provide refinement and separation of polars.

there are many of the methods for the pretreatment  in order to reduce the acid value

but you can use acid catalyzed esterification followed by basic catalyzed transesterification  

or you can use dual function catalyst for the direct transesterification  

Of course all of the above must be after removing the impurities in  the  oil 

"Are there any pretreatment methods for converting cooking oil to usable raw material for biodiesel production?"

This question is questionable, please make it clearer if the answer provided here is not yet satisfactory.

First, cooking (edible) oil could be used or fresh, wet or dry. If fresh, the free fatty acid (FFA) content is always low and there are no particles to call for filtration, but if it is used, then warm filtration and esterification may come in depending on the biodiesel production method.

Researchers are busy and a lot of advances in biodiesel production are popping. Asides transesterification (which usually requires feedstock/raw material oil of moisture content below 0.05% and FFA