..Petro Canada. At least that's what the parts guy at Halton Honda in Burlington, Ontario told me. I noticed they had 5W20, 5W20 synthetic and 0W20 on the shelf. I asked if the 0W20 was synth and all he told me was "it's for the hybrid". So, I asked him who makes the Honda oil and he said "Petro Canada". Now the price is ridiculous $9.80 a litre for the 5W20 synth. I'm sure I could get it at Petro Canada for a lot less.