Just wanted to verify that the Mobile 1 oil filter fits my 2013 volt. It is an M1-101 and is slightly longer than the GM 93178952

You mean like the GM ignition switch engineer?Be aware that the Volt has a special variable flow oil pump and it is very important to use a filter with the correct flow and features as the GM one would have. Do you really want to save a few cents after paying thousands for the car?
Huummmm?? Well not me. I will only use the correct AC filter for the specially designed oil pump circuit.....Then I am a retired engineer type and do believe that the GM engineers know what they are doing and the intended filter has characteristics designed for the high tech application.....
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I got my Fram replacement at Walmart.Autopart's stores do not keep Volt filters in stock.