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Re: What does the 'W' mean?
Posted to Technical Discussion Forum on 2/10/2006 32 Replies

There is no such thing as a 30W.

Oil never gets thicker as it heats up.

A 20W-20 is a multigrade product.

Common products do require VI improving additive to meet 10W-30 rating but some high quality SAE 10W-30 products do NOT have any VI improvers. The h... Login to read more.

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