picked up the C70 with 122K miles on it
figure that its due for plugs
What plugs have you used? - were they any good?

JPJM

 

what I'd do is 1) go to the Volvo manuals web site https://www.volvocars.com/us/own/own...owners-manuals and grab the maintenance manual to find your model's service intervals. Spark plugs change dates vary by engine model - use the two digit code from the VIN position 6/7 (ie "52" etc). to figure out your engine version. 2) Don't over think the plugs - easy thing to do is buy Genuine Volvo from a dealer web store. I use Tasca Parts since they are here in New England but you can find someone closer. More expensive doesn't mean better to a Volvo - ie triple electrode, iridium bla bla bla doesn't help a car if the ignition/coils aren't designed for that kind of plug. See the owners manual for a part reference as well. There's not a big price delta going genuine - particularly for a part that lasts 5 years.