Code:
AddParticles = MOSParticle
MOSParticle = MOPixel
CopyOf = Spark Yellow 2
Count = 2
Spread = 2.25
MaxVelocity = 12
MinVelocity = 8
ParticleNumberToAdd = 10
AddParticles = MOSParticle
MOSParticle = MOPixel
CopyOf = Drop Oil
Count = 3
Spread = 2.25
MaxVelocity = 4
MinVelocity = 1
You're applying gib properties to an explosion particle; and defining a MOSParticle as a MOPixel. Wtf.
Get rid of that part and replace it with just gibs.