my '10 Impreza has 35K miles and I'm (finally) going to change spark plugs.  Even with low miles, I'm wondering if the wires should be done after 5 years as will.. I know, NGK/OEM wires only.

I would use OEM ones myself.  Just in case some sensor works off them.  But I had a 2003 Impreza with many miles, the wires were fine and the car ran well.

Edited August 5, 201510 yr by valvestem

OEM wires are good for far more then 35K miles. When I bought my 99 OBW in 2006, it had 148K on the odo. It still had its original plugs and wires. Wires were still going strong. Plugs were worn down to nothing.

what plugs come ina 10 from the factory? Coppers would likely be getting worn but, if double platinum you can go to 60K easy.

NGK Laser Plats are OE for the car. IIRC, replacement isn't scheduled till 60K. Unless you're burning oil or are just super anal about peak performance, I'd leave them alone. Replacements are ~$7/ea from a local parts house, I think.

 

EDIT: If you want to replace due to age, I understand, but plugs don't age like wires/rubber does. I'd remove and inspect the wires for damage/cracking/hardness, but replace only if damage found. Re-inspect at 50K.

Edited August 5, 201510 yr by 86 Wonder Wedge