Just how badly do we need 0wXX and 5wXX?

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It confirms a couple basic things:

1) VIIs contribute to HT/HS
2) HT/HS goes down over time, from VII breakdown (so obviously, if long-term HT/HS retention is a priority, pick an oil with few VIIs)
3) Lower HT/HS is better for fuel efficiency, but there need to be minimum standards to prevent wear.

- Scott
 
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