Originally Posted By: Pontual
Originally Posted By: weasley
Not that easy, because
you can't predict how different VIIs will interact, ... with each other and with different base oils. You may find that the blend does not meet
any prescribed SAE viscosity classification, since it has to meet KV, CCS, HTHS and MRV requirements, any one of which could go out-of-spec.
+1
If you dilute VII enough with adition of lesser VII content oil, those now too sparse polymers, won't work at all, becuse they can't catch close togheter enough, not making an oil barrier of flow anymore. So, a once 160 VI would be a mere 100 VI, so your stribeck would get a plane rampant climb.
Its the WARM part of the envelope that gets most messed up, not the (cold) W part. The W part is made mostly by the base of the lubricant, but the warm operation aspect is given by the VII additive. Conclusion, you can easily calculate the W part with aritmetics, but the hot part is unpredictable. In this case you'd have a 10W??
The pour point depressants messing, won't be so critical as The VII, in this mix case.