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Originally Posted by turbomart
Dunno where you got that from.
Your right tho about the first number 0w or 5w represents the viscosity when cold, -18 deg celcius from memory. The upper number , ie 40 , represents hot viscosity tested at 100 deg celsius also from memory.
These two viscosities are tested using a different scale so cannot be compared, ie oil does not get thicker.
The first number therefore represents the oils cold viscosity and the second number is its resistance to thinning out.
Therefore a 5w-40 will be thicker up to 100 deg than a 0w-40 at which point they will be the same.
Theres also a lot else to look at with oils, the amount of detergents in the oil the amount of friction modifiers ,etc.
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Yup you're right
I said;
"COLD 0W-40 is still much thicker than HOT 15W-40".
Referring to;
Quote:
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5w is very thin and this may be part of the issue. |
If the 5W being thinner when cold is causing increased oil loss, there would be extremely high loss with any oil (whether a 5W-40 or 20W-40) when hot, since a hot "40" is much thinner than a cold 5W.
