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2018 genesis g80 3.3t spark plugs and oil.

I have bought filters and spark plugs from here, better price than the Genesis dealer. Just replaced the plugs at a savings of >$10 each. Plugs were properly gapped and warned not to try to adjust gap.
Every box of eight plugs that I have ever bought had at least one or two with the gap wrong enough to need to adjust it. Of course, your experiences can be different. The gap can be adjusted if you use the correct tool the correct way (search YouTube) and are very careful not to apply any pressure to the center electrode.
 
It appears the NGK plugs are discontinued and Out of Stock everywhere. What are people doing now aside from ordering directly from the dealership?

I see multiple references to Denso 5346 IKH24 1 step (whatever that means), but not any first hand accounts for our particular vehicles, more on the Stinger side of things.

 
It appears the NGK plugs are discontinued and Out of Stock everywhere. What are people doing now aside from ordering directly from the dealership?

I see multiple references to Denso 5346 IKH24 1 step (whatever that means), but not any first hand accounts for our particular vehicles, more on the Stinger side of things.

After trying to find replacement OEM NGK 97976 Laser Iridium spark plugs Everywhere other than the dealership I reached out to NGK. These spark plugs are not discontinued but are being made strictly for Genesis, Kia & Hyundai dealerships. The Hyundai part number is 18852-09070. Sadly we won’t be able to purchase these in the sub $18 range anymore.
 
After trying to find replacement OEM NGK 97976 Laser Iridium spark plugs Everywhere other than the dealership I reached out to NGK. These spark plugs are not discontinued but are being made strictly for Genesis, Kia & Hyundai dealerships. The Hyundai part number is 18852-09070. Sadly we won’t be able to purchase these in the sub $18 range anymore.
Just paid 36 bucks for each at a genesis dealer. Needed 6 for my 2018 g80 sport sigh
 
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Just paid 36 bucks for each at a genesis dealer. Needed 6 for my 2018 g80 sport sigh
This is ridiculous. Price fixing!
 
I bought a used 2018 genesis g80 3.3t sport last year at about 45000 miles. The car has been great so far. Had to change the thermostat the first month due to a random check engine light however the car was still driving good.

I just noticed in the manual it says spark plugs should be changed every 40k miles on the turbo engine. On carfax I see no indication that this was ever changed. I wish I would have known before purchasing the car so I could have the dealer do it for free at the time.

I decided that I will let my friend who works at Lexus complete the oil change and the spark plug swap. Few questions.

What spark plugs should I get? Should I go to the dealer and purchase there?

What oil filter should I get? Oem only?

Should I use the lexus synthetic oil or should I purchase my own?

If I purchase my own oil, which one should I get? Mobil one fully synthetic?
Unless you are still under warranty, which could only happen with CPO or an extended warranty, I would ask a trusted mechanic to pull one of the plugs and see what condition it is in. I was in the same situation with a used GV80 (out of warranty--as one poster noted, for second buyers, 5yr/60k is the limit), the car (with a 3.5TT engine) was up for its 60k service, the closest dealer wanted almost $2k for a plug job ($3000+ for full 60K), and the local guy wanted $700+ to do the plugs. I asked if he could check their condition and see if they really needed changing as many, many cars with similar operating conditions (turbos and twin turbos, platinum plugs, GDI, etc) easily go up to 100k miles on the original set of plugs--with no harm, loss of power, missfires, lower mpgs etc, or other ill-performance effects. He inspected one of the plugs and agreed it was still in good shape so we pushed the plug job off to the 90k service (same recommendation for the original brakes, though those vary more by driving conditions, etc). If warranty and/or peace of mind are at the forefront, or if money is no object, then by all means, change them now, but it is like changing oil every 4k when the mfg says 8k (and the oil mfg says 15k). It can't hurt, but is rarely necessary, and often wasteful. If you maintain everything else well, have a trusted mechanic (or you are a good one yourself), and stay on top of things, current engineering and current consumable product specs last a lot longer than vintage cars did. Wisdom is the better part of valor.....
 
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