sustina 0W20 10407mi 2012 hyundai 2.0L[IMG]http:

[CATERHAM]

Originally Posted By: tribocessive
my stash of rl 0W20 will be used later- mixed with rl 10W racing oil 25%; my "benicia blend."

I've experimented with using RL 10wt race oil in the past to try and find a lighter pure RL blend and it won't work.
RL 10wt with it's HTHSV of 2.7cP and very low 130 VI is heavier than any dino 5W-20. Your proposed blend will still leave you with efectively a light 0W-30 with an unimpressive 157 VI.
The fact remains that RL doesn't make a true 20wt oil and therefore nothing suitable for any 20wt application.

The best option you have to lighten up the RL 0W-20 is to blend in some Sustina 0W-20. A 50/50 blend will give you a heavy 0W-20 like Amsoil but with a much higher 195 VI.

 

[tribocessive]

gonna have to change my thinking about mixing brands; how about sprint; there would be esters all over the place.

 

[CATERHAM]

Yes Motul Sprint 0W-15 (HTHSV 2.0cP, 155 VI) blended 40/60 with RL 0W-20 would give you a 0W-20 with a HTHSV of 2.6cP and a VI of about 161. As you can see not a very impressive VI and lower than any 0W-20 on the market.

What you could do is wait a couple of years for Honda and Toyota to come out with their new 0W-16 oil grades. Hopefully these will be high VI oils and therefore would be great candidates for blending.

 

[tribocessive]

it's gonna happen; sustina-rl 50/50; it's gonna happen soon.

 

[fpracha]

Originally Posted By: CATERHAM
Yes Motul Sprint 0W-15 (HTHSV 2.0cP, 155 VI) blended 40/60 with RL 0W-20 would give you a 0W-20 with a HTHSV of 2.6cP and a VI of about 161. As you can see not a very impressive VI and lower than any 0W-20 on the market.

What you could do is wait a couple of years for Honda and Toyota to come out with their new 0W-16 oil grades. Hopefully these will be high VI oils and therefore would be great candidates for blending.

It will be interesting if honda & toyota can come out with 0W-5 or better yet 0W-0, because ultimately the viscosity at temperature (80C TO 100C range) is what really matters for the primary wear-protection functions of these oils in engines!

 

[tribocessive]

That is a brilliant point, fpracha! Eneos references the concept of having just barely enough viscosity at normal operating temperatures. You have a shear stabile oil and optimized performance+fuel economy. The purchase of a new motor will not be eventually required. You only have to deal with the anxiety of the numbers in your head.

 

[CATERHAM]

Originally Posted By: tribocessive
Eneos references the concept of having just barely enough viscosity at normal operating temperatures.

That's not exactly the concept.
The idea is to minimize the "excess viscosity" when the oil is cold and before it is up to normal operating temperature. That's the main advantage of a high VI oil. The viscosity at normal operating temp's is unaffected.
The secondary advantage of a high VI is that once the oil is up to temperature, any further increases in oil temperature will further reduce the oil's viscosity but at a lower rate compared a low VI oil. Consiquently high VI oils have a broader viscosity safety margin.

 

[fpracha]

Originally Posted By: tribocessive
Eneos references the concept of having just barely enough viscosity at normal operating temperatures.

Primarily, a high VI oil is essentially a True Long Life lubricant. The sense is that for all normal use driving conditions, high temperatures will not (should not) fall in the range of 150 C. Otherwise Race oils would be needed.
While the rate of fall in viscosity will be LESS for a high VI oil, the benefit of having long oil life while maintaining the original VOA viscosity specs is the actual winning point.
All else follows naturally, because logically such a high VI oil will have other benefits like more consistent and superior wear protection and optimum fuel economy under such normal driving conditions.