Hello,

What is the relationship between oil viscosity and fuel dilution?Is there any simple formula?
Is it true that approx 1% of fuel in oil will decrease viscosity by 4 to 6%?
What are the limitis in fuel dilution?

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Originally posted by FRIXOS:
Hello,

What is the relationship between oil viscosity and fuel dilution?Is there any simple formula?
Is it true that approx 1% of fuel in oil will decrease viscosity by 4 to 6%?
What are the limitis in fuel dilution?

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To my knowledge, I do not think that there is any general mathematical formulae to determine viscosity reduction based on fuel dilution. However, for speccific SAE/ISO grade oils, there are charts to dtermine viscosity reduction for diesel dilution. Oil companies and additive companies technical bulletiens contain these charts. Regarding limits, it vary from one OEM to another OEM; the general rule is 4% to 5% or the viscosity grade falls below one level I.E. sAE 50 to 40 or 40 to 30.
kumartr2@yahoo.com

Bear in mind that fuel is not the only explanation for reduced viscosity. we usually cross check with a flash point (closed cup) test.

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Originally posted by itamar-ict:
Bear in mind that fuel is not the only explanation for reduced viscosity. we usually cross check with a flash point (closed cup) test.

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The question here is the relationship between viscosity reduction and fuel dilution. Ofcourse viscosity reduction can be due to many factors I.E. mixing of lower viscosity grade oil etc.
Kumar
kumartr2@yahoo.com

quote:

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Originally posted by Frixos:
Hello,

What is the relationship between oil viscosity and fuel dilution?Is there any simple formula?
Is it true that approx 1% of fuel in oil will decrease viscosity by 4 to 6%?
What are the limitis in fuel dilution?

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Good Day,

If you know the viscosity of your fuel and the viscosity of your oil then you can use the standard and typical blending charts in the back of most of the lubrication suppliers product information handbooks to give you a rough idea of the viscosity reductions. As previously posted there are many reasons why the viscosity might be reduced however this is the answer to your specific question.

regards......