The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 454 question: Should I be worried about the reliability of my motor?

cadillac_al · 06-15-2017, 05:56 AM

A lot of truck fleets run 15w40 in everything. It's truck oil. Every trucking company I have ever been around always ran 15w40. I wouldn't worry about it. When people try to run 15w40 in modern engines they could run into problems because the engine was not designed for heavy oil; like Caddy Northstars.

06-15-2017, 05:56 AM	#7
cadillac_al Registered User Join Date: Oct 2013 Location: Maine Posts: 2,400	Re: 454 question: Should I be worried about the reliability of my motor? A lot of truck fleets run 15w40 in everything. It's truck oil. Every trucking company I have ever been around always ran 15w40. I wouldn't worry about it. When people try to run 15w40 in modern engines they could run into problems because the engine was not designed for heavy oil; like Caddy Northstars. __________________ 76 Chevy K20 76 GMC K15 77 Chevy C10 77 Chevy K10