Had a similar problem it was not the cylinder head or cracked block but rather a bad oil cooler. in my case the oil was leaking into the cooling system, but have seen it leak both and or the other way around. a Volvo master tech said he had never seen this before, but after he fixed my XC70 he just ...

Personally I use Denso TT Plainum from Advance @ $2.99 ea better mileage and seat of the pants performance. other plugg are good in other vehicles. Next will try thier Irridum plugs. Bosch used to rule, but NGK are my next choice. Volvo OEM plugs are allwaws a safe bet but pricey. Densos in Xc 70 S4...

I own 2 Actrons from Autozone a CP 9575 good middle of the line does more for more expensive other brands. on sale now. the actron 9580 is professional grade puts S On and Bosch $5000.00 plus tools to shame for speed easiness of use and diagnostic capabilities even resets ABS Modules. Both units can...