As we all know, cSt @ 100°C viscosity is affected to the downside by fuel dilution. One would have to presume that the CCS/MRV viscosity at the appropriate xW temperature is likewise affected. Would this presumption be correct? (Maybe my search terminology prevented me finding a discussion.) If it is correct, would fuel dilution ultimately result in a 5W oil mimicking the flow/pumpability properties of a 0w oil?
Fuel dilution and CCS/MRV viscosity
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I’ve never come across a study on the effect of fuel dilution on CCS and MRV viscosity, but I would expect it to decrease both of those viscosity measurements. I’m not sure what the numerical relationship would be. When oil ages and is simultaneously diluted with fuel, the effect of the aging can be to increase MRV and CCS viscosities (this has been studied and confirmed), while the fuel dilution has the opposite effect, in my opinion. If so, whether the viscosities increase or decrease depends on extent of aging and extent of fuel dilution.
If by random chance it just happened to be diluted by the exact amount needed, then sure it would have some properties similar to a lower weight oil, but should reduce the winter 5W # more because those are the winter weights and oil viscosity changes much more with temperature than gas does... diesel excepted.
Better question is what is the importance in knowing this? You have bigger problems if you're suffering this much fuel dilution, should not just throw a 5W oil in and call it fixed.
Better question is what is the importance in knowing this? You have bigger problems if you're suffering this much fuel dilution, should not just throw a 5W oil in and call it fixed.
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Originally Posted By: Dave9
... Better question is what is the importance in knowing this? You have bigger problems if you're suffering this much fuel dilution, should not just throw a 5W oil in and call it fixed.
When did "importance of knowing this" ever become an issue on BITOG? Are you trying to be a jerk or does it come naturally?
But yes, I am wondering if "throwing" a 5W into an engine spec'ed for 0W (2017 Pentastar 3.6L) which does fuel dilute is a desirable action (not that it really matters).
... Better question is what is the importance in knowing this? You have bigger problems if you're suffering this much fuel dilution, should not just throw a 5W oil in and call it fixed.
When did "importance of knowing this" ever become an issue on BITOG? Are you trying to be a jerk or does it come naturally?
But yes, I am wondering if "throwing" a 5W into an engine spec'ed for 0W (2017 Pentastar 3.6L) which does fuel dilute is a desirable action (not that it really matters).
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