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Re: Oils for older vehicles and new engine break in
Posted to Castrol Forum on 6/12/2017 1 Reply

Hi Lewis.

In the case of a 5W-50 the oil has a thick viscosity at high operating temperature defined by the SAE 50 grade ( thicker than an SAE 40 or and SAE 30 for example) and the good low temperature flow properties of a 5W at low temperature ( that is bet... Login to read more.

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