Superfast1

Has anyone used the Bosch 4501 (FGR8DQI) Fusion Iridium Platinum spark plugs for your LS400? Some websites stated these plugs are compatible but others stated not so would like to get your opinion on it. I've recently replaced all mine w/ OEM plugs. Just wondering if anyone had use the Bosch's.

RA40

iTrader: (6)

I'd used their basic platinum plug long ago, I didn't have any issues with them. The sampling here the preference is the NGK or Denso iridium.

dicer

Just like autolites in fords and AC in gm's, Bosch seems to work in german cars, I'd go with what RA40 says.
For some stupid reason brand specific plugs work best in the brand specific cars, I have always disliked Bosch and autolites, but I was always a Chev person then.

Losiracer2

Usually the parts stores have sales on the NGK Iridium IXs every once in awhile. I think I got my 8 when they were 5.99 a plug, so it saved me quite a bit compared to the 11.99 a plug for a Denso Platinum.