How to find and decode a particular protocol
LIN always starts with a break, a voltage drop from its inactive state of 12v to low for 13 bit times then always follows this with a sync of 0x55 which gives a regular 1010... pattern for the slave nodes to sync their baud rate on.  This gives LIN a distinctive look, the long break followed immediately by the spikey sync.  LIN also then sends another byte telling the bus which node should respond.  Then the nodes respond with their data.  LIN is also slow speed so it does look LIN like but not to the rigorous spec.  The LIN protocol may give an insight into how to tackle this.