I'd recommend getting either spark plug yourself at a parts store, they last much longer than platinum spark plugs and offer more performance. plus the rutheniums, if available for your model year, offer slightly better fuel economy as well. if you want the ones with the longest longevity and best performance I'd get iridium high ignitability, but those can be costly. definitely go with NGK. bosch are also decent and denso are usually oem but I personally prefer ngk.
I had good luck with ngk bp6hs, Bosch w8Bc, champion l87yc and renault oem short thread (yes, really.) plugs. Bosch w8ac used to be good but i had some arrive not working out of the box recently so I'm now avoiding them.
I put NGK B5HS plugs in mine, no complaints so far.
Torch F7tc took 3-5 attempts to crank. This NGK paired w my Wgen11500 cranks first try every time. Very pleased.
RX7 mark 1. Wouldn't rev past 6000 with Champions, replaced with NGK and sang like an angel. It's not the price, it's the quality.
Go NGK and Iridium. They are a better spark and help burn any sediment off the tip. Also bonus is, they last about 50-80,000km.
the spark plug is less than 10k km old (bosch) so I initially did not change it. Decided to change it anyway to original mercedes (turns out made my NGK) bam emission passed, LTFT now hovers at 5-8%.
Year ago I bought 2018 R3 for track, for maintanence purposes ive changed spark plugs then, for CR8E obviously because everywhere in Internet and service manuals it says so. Also i took out of this engine used CR8E so everything was fine. Now, funny thing is Im now in process of rebuilding this engine and after taking off engine head realised that spark plug is too short and i was like wtf?!… So for everyone who has at least 2018 R3, go for LMAR8A-9, too short spark plug will
work obviously, I did 3000kms this year on track, but this may affect performance…
Just get stock NGKs, I’ve never had brisk plugs last for anything, and the fuel stratified cars don’t really suffer from spark blowout in the same way.
I replaced my sparkplugs, and everything went smoothly except for the front plug on the driver's side. All the other spark plugs screwed in with little to no need for a socket wrench - except for tightening at the end.
This one plug seems to be stuck halfway down the middle of the thread and won't go deeper unless I really torque it. When I took the new spark plug out, I noticed that the tip was bent with the spark gap being much smaller than the other new piece.
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