Bought this one for my 2.4i 07 -
NGK
What concerns me is that Amazon says it's not compatible with my s40 2.4i 2007, even though I've heard it is.(from here)
And it says it's compatible with T5.

Checked the gap, it's good. Checked the thread, it's good.
Then is it compatible?
Thus, can I ignore Amazon My car recommendation?

 

The two engines use different spark plugs.

 

I used RockAuto and compared the two plugs recommended for the different engines and they are exactly the same size and heat range with a slight difference in spark plug gap. Although Iridium plugs are overkill for a normally aspirated car it won't hurt anything.


Center Electrode Core Material Copper Core
Center Electrode Tip Material Iridium
Gap Size 0.032 in
Ground Electrode Quantity 1
Hex Size 5/8"
Insulator Height ISO
Manufacturer Heat Range 6
Additional Info 5K Ohm
Seat Type Gasket
Reach 26.5mm
Thread Diameter 14 MM
Ground Electrode Tip Design Standard
Ground Configuration Standard
Ground Electrode Core Material Nickel Core
Alternate/OEM Part Number(s): ILFR6B


Center Electrode Core Material Copper Core
Center Electrode Tip Material Nickel
Gap Size 0.024 in
Ground Electrode Quantity 3
Hex Size 5/8"
Insulator Height ISO
Manufacturer Heat Range 6
Additional Info 5K Ohm
Seat Type Gasket
Reach 26.5mm
Thread Diameter 14 MM
Ground Electrode Tip Design Standard
Ground Configuration Standard
Ground Electrode Core Material Nickel Core
Alternate/OEM Part Number(s): 4704, LFR6D

 

thanks, different ground numbers , plug gaps, how should it affect my car? Fail in emission test or something?

 

You shouldn't notice anything. Iridium plugs with a smaller gap are used on turbo engines to prevent detonation and spark blowout. Neither issue is of concern for a non-turbo engine. Since the Iridium plug is more expensive it's even more reason not to use them. So did you find a screaming good deal you couldn't pass up?

 

I was just going off the Volvo part numbers. I don't know the differences but there is a difference.

 

Yes I had. The only difference between then was under 20$ in total so in my brain - okay, this should be the better one.