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Re: 1969 BUICK RIVIERA
Posted to Castrol Forum on 9/29/2017 1 Reply

First, there is no reason to add any zinc supplements if you select the correct fully formulated product.

SAE viscosity ratings cover a very wide range. This is a chart that represents the SAE J300 viscosity [SAE J300 Viscosity] when older cars were produced... Login to read more.

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