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.....