Can you mix plugs of the same brand?
 

So I had 7 ngk v power plugs and one other brand that had a cracked insulator..idk who did it..just bought the car. Would it be fine if I just swapped out that cracked one for a ngk g power platinum? Or should I replace all of them with ngk platinums. The v powers all look fairly new.

Just put another V power in it.

You can put in what ever you want.....

that being said, if you put a platinum plug in your car, you should do a search on spark plugs,

Standard Copper plugs for the win.

Nobody has answered my question.....I don't see why its so hard

Lets look at this here.

A V Power cost under 3 dollars a plug.
So 3 x 8 = 24.

So behind all logic, swap all the plugs at once.

Platinum and Copper have different properties.

Platinum plugs retain heat burning themselves clean, thus giving a greater chance for detonation as they are hot longer.

Copper dissipates heat quicker. They don't last as long due to this feature.

Do a simple search on copper vs platinum and you will find a lot of information on this subject.

No, it won't make any difference at all.