Have a misfiring on the 2nd cylinder and guess it's time to have the spark plugs changed. Will go with original Volvo from Amazon, but am not sure about the Ignition Coils. There are sets of five for $65 on Amazon from A-Premium.
Anybody knows them? Or is it highly recommended to use these super pricey Volvo ones?

Thanks

Edit: 2.5 T5 model...

 

a set of 5 is $200 from Bosch. I, and many other Volvo owners, like to stick with OE or Volvo brand parts. For spark plugs, definitely go Genuine Volvo.

With coils, you don't have to replace all of them, if you know you have a bad coil, you can replace just the one.

 

Thanks!

 

Before you replace a coil, swap it to another cylinder to make sure the misfire follows the coil - and I sell coils one at a time as they go bad - with only the factory brand or bosch coils, making sure the spark plugs are good or new.

 

Great tip, thank!

 

This tip turned out to be a winner. Swapped #2 and #3, now #3 is having a misfire.
Will see if I can get my hands on a Bosch. Tried a cheapo from Amazon and the connector didn't fit.

However, I am confused about the spark plugs. I got original Volvos ones, they are the longer ones. The existing ones were shorter (car was previously maintained by a Volvo guy), so I took shorter ones from AutoZone, concerned about ruining the engine.
I also get different results on different websites like Bosch and FCP.
So which ones belong into the S60 2.5 5T?

 

Call your local dealer and ask for the correct spark plug number for your VIN.

At some point (don't remember when) longer plugs were specified.

 

I used aftermarket coil packs as a dealer for 20 years. They worked fine. Typically I could get a box of 6 for about $50 and they were actually private labeled parts.

I also used Denzo plugs which are also a popular supplier. Replace plugs and coil packs. Make sure that you don't have oil piled up on top of the engine.