HPR10 is too thick for 6g7 motors in some winter climates here. That certainly was the case with my engine.
I've done nearly 5k on the HPR5 now which included a few test n tunes. HPR5 seems to be a perfect Synthetic for stock/mild Magna V6's.
Thin enough to flow well from start up in the cold & good enough viscosity to handle summer heat.
I wouldn't say it's any better than Shell Helix ultra or Mobil1 though (personally I still think Mobil1 is the pick of the bunch but it's the dearest) - Just my opinion.
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