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Re: Oil viscosity recommendations GM Longblock
Posted to Technical Discussion Forum on 5/26/2003 3 Replies

The "310" cap on my 93 Vin Z GMC full size truck says "designed for use with 5W-30 motor oil".

For initial break-in, it would be the better choice, but for long term heavy duty use in a full size pickup I have gone with a high quality 10W-30. Login to read more.

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