Is there a way to tell if the previous owner changed spark plugs?

[ms2000]

2013 Sport Auto with 110k.
I got it with 85k in good shape.

Is there a way to tell if the previous owner changed the sparks?

If that matters, I did 160 (2x80) miles mostly freeway and it gave 30mpg. I did 75mph, and 20mph when the freeway was trafficy. I just recently used Red bottle additive to my gas tank.

 

[ms2000]

Does Mazda put any special color?

 

[MarioT]

2013 Sport Auto with 110k.
I got it with 85k in good shape.

Is there a way to tell if the previous owner changed the sparks?

If that matters, I did 160 (2x80) miles mostly freeway and it gave 30mpg. I did 75mph, and 20mph when the freeway was trafficy. I just recently used Red bottle additive to my gas tank.

I'd like others to confirm what they saw too, but from memory, when I changed them at 65kmiles they still looked brand new. I think the only thing I noticed between the original ones and my NGK replacements was the FOMOCO branding. I used the same exact NGK LTR5BI13 from Rockauto. Maybe the dealer ones also have the FOMOCO branding too, so YMMV.