Originally Posted by Ryan
Oilman very interesting read, could you do a simliar exlpanation for the "5W-40 etc" numbers
I.e which do you choose.
10w-40 or 20w-50 say they both had very simliar HTHS values
Many thanks
ryan
If they do then either the 5w-40 is damned good or the 20w-50 is very poor.
The figures should be compared within the same viscosity i.e. look again above at the 3 15w-50's I've listed they're all about the same.
The thicker the oil, the higher the number should be for example a 10w-60 should be higher than a 5w-40 all things being equal. By this I mean same basestocks in them - However as explained on many occassions, all things are not equal as there are synthetics and synthetics!
Hope this explains.
Cheers
Simon