HPL PPPCMO 0w-16 Cold Crank?

[Astro_Guy]

Our 2010 Prius seems to be on its last legs, not due to any hybrid battery issues but a plain old ICE head gasket failure. We've been looking into replacements in the 2020+ range and they all call for 0w-16.

While looking into HPL PPPCMO we couldn't help but notice that the cold crank simulation was far higher on the 0w-16 vs. either the 0w-12 or 0w-20. Is that a mistake? Perhaps one of you Tribologists could explain this. Thanks in advance.

 

[slacktide_bitog]

Try some head gasket sealer first

 

[ka9mnx]

Head gasket replacement should not be that hard or expensive?

 

[OVERKILL]

While looking into HPL PPPCMO we couldn't help but notice that the cold crank simulation was far higher on the 0w-16 vs. either the 0w-12 or 0w-20. Is that a mistake? Perhaps one of you Tribologists could explain this. Thanks in advance.

It's definitely not "far" higher than the 0W-20, it's just slightly higher. Likely means a slightly heavier base oil blend and less VII, vs the 0W-20 and a heavier base oil blend than the 0W-12 (necessary for the lower HTHS in the 0W-12 I suspect).

 

[oil pan 4]

I would just run a 20 weight.
They recommend 16 weight for maximum cafe social credit points but if you read the manual you'll likely find that 20 and 30 weights are acceptable maybe even preferred for some climates.
If you live in the ridiculously cold part of PA you probably want whatever gives the lowest cP number on the cold crank sim, at least during the winter.
Last time I saw a list of -30c cold crank numbers showing a few dozen oils Mobil1 0w-30, exactly which one I don't remember, it scored the best. That was several years ago and may have changed since then. I was surprised to see a 0w-30 beat 0w-20 oils.

 

[Astro_Guy]

It's definitely not "far" higher than the 0W-20, it's just slightly higher. Likely means a slightly heavier base oil blend and less VII, vs the 0W-20 and a heavier base oil blend than the 0W-12 (necessary for the lower HTHS in the 0W-12 I suspect).

5659 / 3979 = 1.4222

42% seems far higher to me. Am I missing something here? Are both figures just so low compared to something like Mobil1 EP that it just doesn't matter?

 

[OVERKILL]

5659 / 3979 = 1.4222

42% seems far higher to me. Am I missing something here? Are both figures just so low compared to something like Mobil1 EP that it just doesn't matter?

Look at MRV, they are almost identical. Also, the VI of the 0W-16 is 148, so it's probably almost a monograde, hence my mention of it having a heavier base oil blend.

They are all well below the limit, so it really doesn't matter.

 

[weasley]

Look at MRV, they are almost identical. Also, the VI of the 0W-16 is 148, so it's probably almost a monograde, hence my mention of it having a heavier base oil blend.

They are all well below the limit, so it really doesn't matter.

Have a look at the pour points too - the 0W-16 has the lowest of the three.

 

[Astro_Guy]

Have a look at the pour points too - the 0W-16 has the lowest of the three.

Okay - so the 0w-12 has the lowest MRV viscosity, the lowest viscosity index, but the highest pour point. Could anyone explain how this is possible?