Normalization can be a tricky nut to crack sometimes.  
I probably would split it into at least 2 tables. You could theoretically have more than one truck that is the same model.
Alternatively you could also acquire other equipment you want to track / other equipment that you need to know the parts for.  Forklift, skid loader,  crane, warp engine.  You wouldn't want a separate table for each piece of equipment.
Instead you would want to have 2 tables.  That way you aren't constantly changing your tables and forms.
You forgot Spark Plugs.  Make a change.   oops, now I need to track Brake Shoes. That's another change You get the idea.

EquipmentT
   EquipmentID   'Primary Key
      Model        
      S/N
      PurchaseDate
      PCost
      Other information unique to that piece of equipment

MaintPartsT
   MaintPartID 'AutoNumber - Primary Key
   EquipmentID 'Foreign Key related to Equipment
   PartName
   PartNumber
   QuantityNeeded  'default to 1
   Other information needed for Maintenance Parts

Hope that helps.  
For more see:
   Too Many Tables
   Normalizing Data
   Chef's Kitchen Helper
   Access Developer 19 - Kitchen Helper

By the way,  want to know when you did that last filter change?  Tire rotation?
What's coming due?

More tables and forms.
See the Vehicle Maintenance video