Spark Plug Suggestions

167k. Just replaced with

$47 NGK 6619 Iridium Spark Plugs LFR6AIX-11 - 6 PCSNEW

NGK 6619 spark plugs and 4 brand spankin’ new Standard Blue Streak UF 495 coils. Man, once I get this bitch eventually into 5th gear this truck is a lil monster. Pleased

 

Have been having engine issues recently (cylinder misfire, hard idle).
I pulled the plugs and realized they had been replaced with single ground plugs.
Replaced all six with plugs from Toyota (part #90919-011920), been driving better ever since.

 

I couldn't resist trying a set of the Denso TT's....
they're at 5K now......at 10K I'll pull em and take and post pics on them...

I'll put em next to some ngk's iridium's about same age...

We'll see if that welded whisker holds up....

I'll put in the Ruthenium's next... with discount.....$11ea from advance......
think these may be best for those who drive alot of highway miles....
they provide best spark at higher rpms.....over the denso's.....

For stop and go traffic the TT's provide a real fine spark at those two tips...
that in theory degrade even slower than the 100K ones of yesterday.....

 

Any advantage over stock?
I got mine from Toyota dealership for $5 a piece.

 

I dont give a rats ass what kind they are....I'll always gonna switch out in the 20 ~ 30K range....

These trucks dont get that great of gas milage....they need every help they can get.....

Dealer ones are fine.....

 

Same with oil....dont matter what kind....

as long as its the change me often kind.....

My truck is 99% stop/go traffic.....so I figure that cuts cycle lifes in half....
oil, atf, steer fluid, brake fluid, coolant, plugs and wires.....
Plus anything else that cooks under the hood...

 

Thanks for all the replies everyone. Think I’m gonna go with iridium because I drive a mix of stop/go city traffic and long highway miles so I would prefer the longer life of the iridium. I’ll probably look at the iridium TTs as suggested. Glad there’s more opinions than just “OEM or die”, I get that it’s usually a good idea to go with what the vehicle was designed for but also something like spark plugs where technology has advanced from 2003, seems like changing from OEM won’t hurt anything… as long as my gap is set correctly and it supplies a spark then I’m good to go.