Both NGK and Denso OEM Spark Plug on Toyota Engine?

M

Murphy L

New member
I just replace the original spark plug on my mother's 2003 Camry V6. I noticed that one bank (cylinder head) had NGK while the other was Denso. NGK and Denso are pretty much the same plugs to the spec. With a little bit of research, I found that it is not uncommon for Toyotas to have two different plugs on each backs like on 4Runners and Tundras.

Is there a reason for Toyota having two different plugs on the same engine? I know they always list both NGK and Denso in the manual, but never think they install both in the same engine.
 
Was this a used vehicle? My guess it that a previous owner (assuming it was used) chose to mix the different brands. Although not necessarily a major problem, I would personally choose to use same brands. Much like tires, there are those who choose or end up with mixed brands.

As spark plugs are relatively cheap, I would eventually want to match all with the same brand.
 
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