Spark Plug Mix Up?

Ok changed my plugs and wires today on my 03 Taco with 3.4L, straingest thing.
The 3 plugs (cylinder 5, 3, 1) were NGK R BKR5EKB (pass. side) the other 3 plugs, (cylinder 6,4,2) were Denso T16TR11 (drivers side)

Why would Toyota use 2 different brand plugs? they were the oem plugs installed by the factory, this is the first time changing them. I purchased the truck new with 3 miles on it back in 2003.

 

Best answer I have seen on the Toyota plug discrepancy.

Frank

 

Does that mean this is the first time those plugs have been changed?

 

I think it's even simpler than that.

Toyota likely has purchase contracts with both NGK and ND.
In order to avoid running over on one contract and have a surplus on the other, thus, pissing off the manufacturer, they simply load the assembly line with both plugs for the "V" engines.

My '03 Tundra 4.7 was the same.

If it were a resistance issue, they would be more likely to include that compensation in the coil packs, and mold the hold-down lugs so the packs are left/right specific.

 

Thats funny, went to the Toyota parts dept, my friend looked up the vin and gave me the plugs that this truck calls for:
Denso T16TR11

 

Reading comprehension....

 

yes first time changing the plugs, truck just hit 50K

 

Didn't read that far.

I'm so ashamed.

 

that sounds like typical of Toyota, How did the truck run after changing the plugs and wires?

 

Brianz truck runs great, just strange never ran into anything like that.

 

Both NGK and DENSO are considered ORIGINAL EQUIPMENT OE for TOYOTA'S.....So it's okay.....No worries about the 2 different types.....