Gary, here's a quote from Oilman where I asked a similar question, but this was reference to 0w40 and 5w40, but the same principle applies I would have thought...
"A 0w will flow better at cold temps then a 5w, however with the UK ambient temps there difference is marginal.
As in, the 5w will pour down to -30degc, the 0w will pour down to -35degc, you really have to be in the arctic (wich is what 0w was invented for) for it to make a difference over a 5w.
Cheers
Guy."
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Originally Posted by FinchysSaxo
Some say hes the biggest drug dealer in Toadville!
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Originally Posted by sax-oli
and that his dealings even stretch as far as Brazil!
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Originally Posted by Colin
All we know is that he's called the Toad!
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