Hi everyone. I am new to the forum and looked around a little bit but could not find an answer to my question. I am about to change the spark plugs on my 2008 GS350 and wanted to stick with the OEM Denso plugs. I noticed that Denso had two different plugs for my car, the 3473 and the 4705 and was wondering what the difference is besides the price gap and which is closest to the factory set?

Car started up rough and threw code P0300 and P0304 cylinder 4 misfire and the car only has 76K miles so I wanted to start with changing the plugs and possibly the coilpack on cylinder 4.

Any feedback would be greatly appreciated. Thanks.

 

I purchased the 4705 since it has the OEM Twin-Tip design. I think the 3473 are the regular design Iridium plugs.

 

Thanks - the 4705 seem to be double tipped and gapped to .040 while the 3473 seem to have 3 prongs and are gapped to .044, and it seems .044 is ideal gapping from online research. Just don't want to do any damage long-term, and have it idling at its best based on the gapping.

 

From what I know from oem plugs is theres an iridium and non iridium plugs. The iridiums (more expensive) last longer, while the non do not. I would stick with iridium as the GS are sensitive to spark plugs. Also when buying plugs, be aware theres so many fake spark plugs on the market. If you look on ebay and see oem plugs for $20 bucks for all 6 more likely there fake.

For my 08 I used your first part number FK20HBR11 denso 3473

 

Thanks - both seem to be iridium, just the #4705 is gapped less and and is 2 pronged instead of 3 like the 3473. Seems like lots here use both about the same, so I will stick with the 3473 and pick them up at my local Advanced Auto to avoid the fakes for $76, thanks for the help.

 

I got mine from lexuspartsnow for like 20 bucks each.

 

I also use FK20HBR11