I use Zerex G-05. I hope you can find it. I bought the `unmixed` Zerex so I mixed it 50-50 (60-40?) with **DISTILLED** water. Also available to buy, a pre-mixed `50-50` diluted version.
http://content.valvoline.com/pdf/zerex_g05.pdf
http://www.ebay.com/itm/ZEREX-ZXG051...ZWrA9W&vxp=mtr
About the valve cover (maybe you already have this?)...
Try to stay away from the cork type gaskets which are usually more than one piece gaskets. Crap. And they leak a lot.
Highly recommended to use the one-piece rubber gasket, great quality, no leaks, you`ll see. Usually available as `GOETZE`, FCPEuro and Am@zon have it for sale.
See them both, here:
https://www.fcpeuro.com/Volvo-parts/...cover%20gasket
Yes, the shitty leaky ones are cheaper... but not reusable
VS the rubber 1-piece gasket that IS reusable, @ $25-30.