The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Which grade oil should I use for my motor?

**Jurassic-1** · 07-16-2015, 01:43 PM

I run straight 30 in winter and 40 in summer. I just purchased the Zink additive and will be using it along with the new oil.

07-16-2015, 01:43 PM	#26
Jurassic-1 Registered User Join Date: Jul 2007 Location: New River Arizona Posts: 1,180	Re: Which grade oil should I use for my motor? I run straight 30 in winter and 40 in summer. I just purchased the Zink additive and will be using it along with the new oil.