Finding 0W20 for my HCH is difficult as well. The dealer sells a conventional 0W20 for the same price as a synthetic. I get it at Canadian tire whenever it is on sale. Our Walmart rarely has it and won't order it. I end up mixing 2.5 litres of 5w20 conventional with a litre of syn 0W20. It works for me. I normally stay with mobil for the dino since that is what the synthetic is. I run straight 5W20 in the summer. Have fun, you have a great car. Remember to change the transmission CTV fluid every year or so and you can clean your EGR valve instead of replacing it like the dealer says. I clean it with carb cleaner each time I change the CTV fluid.