Technically sae30 mono qualifies as a HDEO.....so Texaco lawnmover sae30 oil (our company Petrol had rebranded Texaco oils in the past).
Nowadays....Rimula R6M 10W-40
Nowadays....Rimula R6M 10W-40
I recall the first HDEO I ever bought was Rotella 15w40 conventional or whatever. Dad said his first was DELO SAE 40