G-oil high viscosity at 150C

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friendly_jacek

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I used VOA results for G-oil from here: http://www.pqiamerica.com/January2012A/January2012R2/goil.htm and plugged in the viscosity calculator here: http://www.bobistheoilguy.com/viscosity-calculator/ The result is 4.37 cSt at 150C Very impressive. Explains higher oil pressure that some reported, lack of API starburst (no fuel conserving), and good wear numbers on UOA. However, increased fuel consumption could negate savings even when one gets the oil free after rebates. Edit: never mind. I plugged in the other oils and got similar results: http://www.pqiamerica.com/Janaury%202012%20test%20results/Jan2012b1.html I guess the calculator doesn't approximate HTHS numbers.
 
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I have been using G-Oil in my 2007 Hyundai Azera with a 3.8v6 for the last year. If anything I have seen an increase in fuel mileage. With the price of other oil going sky high (mobil 1 and valvoline synthetic) I will continue to use this group 5 synthetic (G-Oil)from here on out. P.S. 5W-20 will be coming out this spring.
 
It doesnt look too bad to me. It has a bunch of moly and boron and zinc is pretty hefty around the other brands like castrol and QS. It is even on the light of the 30w its like a thick 20w. I like it. There was an explorer or something that did a uoa with this stuff and it was a really good one.
 
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It's too bad G-Oil doesn't provide the HTHSV rating for this bio-ester based oil. But like most ester based oils it's likely high as one member found out with uch higher oil pressure than what he had running M1 5W-30. The thing is, a higher HTHSV is not better if that's not what you want. If as it appears, that this oil behaves like a 40wt oil then that's what it is regardless of it's lowish KV values. I which they made a 20wt oil, maybe they will soon, that might be more appropriate for most of us.
 
The Exploder UOA was mediocre. The really good UOA was from a 10K run on an old, high miles Volvo.
 
Originally Posted By: fdcg27
The Exploder UOA was mediocre. The really good UOA was from a 10K run on an old, high miles Volvo.
I remember that UOA and there was no other UOAs to compare it to. Might have done much better than other oils; there is no way to tell.
 
The thing that often gets forgotten is only metallic/element type additives show on a uoa.. some oils look really bland because you arent seeing half of whats in the oil. not saying this is true or false for this specific oil.. as that would be speculation and not fact.
 
Originally Posted By: mechtech2
Also, 150C is very rarely relevant in real life.
For sure, at 150C/302*F your engine has long stopped running...
 
Originally Posted By: mechtech2
Also, 150C is very rarely relevant in real life.
But that's not the OP's point. The OP is alluding to a high HTHSV which has every thing to do with viscosity at normal operating temp's and this oil appears to be a 40wt in reality.
 
Originally Posted By: TFB1
Originally Posted By: mechtech2
Also, 150C is very rarely relevant in real life.
For sure, at 150C/302*F your engine has long stopped running...
The most important spots in your engine see close to that 150 in regular driving and about that in severe. This is a high shear measurement of apparent viscosity expressed in cP. It was originally developed for bearing film thickness but it's a good tool for other stuff (oil pressure, fuel economy, compression/cylinder seal, bottom end wear...).
 
Originally Posted By: Rand
The thing that often gets forgotten is only metallic/element type additives show on a uoa.. some oils look really bland because you arent seeing half of whats in the oil. not saying this is true or false for this specific oil.. as that would be speculation and not fact.
This is a great point that I didn't even consider!
 
Originally Posted By: friendly_jacek
I used VOA results for G-oil from here: http://www.pqiamerica.com/January2012A/January2012R2/goil.htm and plugged in the viscosity calculator here: http://www.bobistheoilguy.com/viscosity-calculator/ The result is 4.37 cSt at 150C Very impressive. Explains higher oil pressure that some reported, lack of API starburst (no fuel conserving), and good wear numbers on UOA. However, increased fuel consumption could negate savings even when one gets the oil free after rebates. Edit: never mind. I plugged in the other oils and got similar results: http://www.pqiamerica.com/Janaury%202012%20test%20results/Jan2012b1.html I guess the calculator doesn't approximate HTHS numbers.
In order to compare the Kinematic viscosity at 150C to HTHS, you need to convert kinematic vis to dynamic vis. You do this by multiplying KV by the density, in gm/ml. A good average value for density at 150C is .765, so the dynamic viscosity at 150C would be ~3.34. This is probably higher than the actual HTHS, as very few oils have DV150 equal to HTHS.
 
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The HTHSV of 3.5cP just confirms what we suspected based on the high oil pressure and lack of an energy conserving label. This oil would be a good substitute for GC 0W-30 particularly in light of it's higher 172 VI. This oil would be great in any application requiring a HTHSV 3.5cP oil like Bimmers, Audi, Mercedes etc. Ant the price is a bargain. Unfortunately it's not yet available in Canada.
 
I'm thinking HTHS could be very close to 3.5 indeed. I plugged in G-oil viscosity numbers from the official MSDS and the kV@150C is a bit higher at 4.48. Converted to dynamic viscosity as per the A_Harman's post above it is DV@150C 3.44.
 
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