when we see the lube oil grade its 15w/40 or 20w/40 in this what is W Explain

when we see the lube oil grade its 15w/40 or 20w/40 in this
what is W Explain breifly

Question Posted / ds01151

when we see the lube oil grade its 15w/40 or 20w/40 in this what is W Explain breifly..

W -winter grade ( temp), 40 means SAE viscosity number

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