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Oil Sands are very different from what would normally be regarded as "heavy oil".

following from Wikipedia:
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Generally speaking, oil with an API gravity between 40 and 45° commands the highest prices. Above 45°, the molecular chains become shorter and less valuable to refineries.^[4]
Crude oil is classified as light, medium, or heavy according to its measured API gravity.

• Light crude oil has an API gravity higher than 31.1° (i.e., less than 870 kg/m³)
• Medium oil has an API gravity between 22.3 and 31.1° (i.e., 870 to 920 kg/m³)
• Heavy crude oil has an API gravity below 22.3° (i.e., 920 to 1000 kg/m³)
• Extra heavy oil has an API gravity below 10.0° (i.e., greater than 1000 kg/m³)

However, not all parties use the same grading.^[5] The United States Geological Survey uses slightly different ranges.^[6]
Crude oil with API gravity less than 10° is referred to as extra heavy oil or bitumen. Bitumen derived from oil sands deposits in Alberta, Canada, has an API gravity of around 8°. It can be diluted with lighter hydrocarbons to produce diluted bitumen, which has an API gravity of less than 22.3°, or further "upgraded" to an API gravity of 31 to 33° as synthetic crude.<sup>[7]

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what is the API gravity/grade of Lakes "heavy oil"?</sup>