NOACK of GC

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Anyone know? I believe that this may be the reason I am having some consumption issues in a turbo application while in a hot climate.
 
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In December of 04 Green GC tested at 11.28% D5800. I doubt that is the cause in oil consumption issues for the Turbo engine. UOA would help ID the issue. Cheers, Terry
 

Gilitar

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Well, I have had zero consumption with Syntec 5w40 in the very same application. I believe it was tooslick that said something about molecule size in making a 0wXX oil was to blame. I like the idea of a true synthetic and none of the readily available VW502 5w40 oils use a real synthetic base. I am starting to lean towards RL 5w40 VW 502 rating out the window.
 
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Gilitar, As just one example: Amsoil 0w-30, Noack of 8.4% Amsoil 5w-30, Noack of 6.6% Amsoil 10w-30, Noack of 5.4% Those are PAO stocks, but Group III's would follow the same general trend. Higher molecular weight basestock blends simply evaporate less; reducing the # of polymeric thickeners also seems to reduce volatility. I suspect some of this VI modifier burns off as well. Redline uses thicker basestocks and little or no polymeric thickeners. If it doesn't work for you, nothing will. TS
 
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I see near zero consumption with Redline. I see some consumption with GC, probably a touch more than with M1. GC is good stuff and I don't mind adding a few ounces every few K.
 
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No visible consumption with Redline. No visible consumption with GC. Same car, same driving conditions.
 
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Independent tests that I can share because they are older show: RL 10w30 @ 5.66% 2004 Amsoil XL-7500 10w30 7.48% 2001 Amsoil 10w30 12.06% 2004 M1Supersyn 10w30 9.77% 2004 M1 Tri-Syn 10w30 6.65% 2000 M1 Advanced Formula 10w30 5.58% 2000 Anything less than 12-15% is just dandy for a PCMO in a engine that is well maintained.
 
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quote:
One other point -- volatility, whether measured by flash point or NOACK, is mainly an issue for the catalytic converter. It has little effect on oil consumption which is mostly a function of engine design, oil burning and leaks. Very little oil is lost to evaporation under normal driving conditions.
Tom made this point in another thread and I couldn't agree more. M1, has very low Noak, yet some experience more oil consumption with M1 than dino oils that are in the 13% range, vs M1's 6-9% range. I don't think you can always tie Noak to oil consumption. Like anything else, it's more involved than that. Terry thanks for sharing that data. [Cheers!]
 

Gilitar

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My consumption is only approx 1/2 qt per 3000 miles. I believe it is consuming the oil when oil temps get above normal due to the fact GC is a hair lighter than the 5w40 I previously used. I occasionaly drive the car fast (120 mph+) I bet the consumption is happening when the turbo heats the oil up....
 
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Why not analyze the oil and find out for sure. I will state again that I doubt it is the oil construct that is affecting consumption.
 

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Yeah high oil temps which thins the oil and high rpms which flings more oil into combuston chambers is a ripe condition for burning oil.
 
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GC usually performs well in cars that do consume oil. Oil consumption can be tricky to pin point sometimes. I agree with Terry and do not think it's the oil.
 
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It's a combination of both viscosity and Noack volatility that typically determines oil consumption in service. Noack volatility has been a part of the API gas engine and diesel engine requirements specifically for this reason. Oils that break down chemically and form volatile compounds also tend to show higher oil consumption. I believe the API/SM and API/CI-4+ spec limts for volatility are now 13%. TS
 

Gilitar

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I was just checking to make sure you guys were awake.... I'm just going to switch back to 5w40 since that seems to stop consumption.
 
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