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Paul Workman · 10-14-2016

Hard to think of another topic hashed more and seeded with as much sales hype and in some cases misinformation as oil. Chemical engineering ain't my long suit: I have lots of company I'm sure.

So! What's the best answer? Are bought and paid for studies honest? What lubrication requirements are unique specifically to the LT5 that might frame the decision/choices?

Far beit from me to presume ro offer expert opinion or recommendations based personal expertise. But, it is possible, I think, to identify some of the most important things which distinguish the motor from some of those others with their pushrods and roller tappets, and limited rpm range, for example,

The things that jump out at me and other students of the LT5's characteristics is: flat tappets, 7000+ rpm redline, long and numerous chains, smallish cam sprockets, viscosity srability of synthetic oils over extreme temperature change, the chemical makeup (features) of oils specifications at the time the motor was built.

All this considered as well as recommendations from those knowledgeable people I and others trust, is how I came to settle on Amsoil 10W-40 recommended by Marc Haibeck.

I'm more WARRIOR than WAXER. 7000+ rpm reached ea. outing is "normal". In it's 9th season now, and she runs like a fine watch. So far so good! I'll stick with what is working in the knowledge unique LT5 requirements are specifically being met...at least so it seems!

10-14-2016	#9
Paul Workman Join Date: Nov 2007 Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri Posts: 6,466	Re: oil change question Hard to think of another topic hashed more and seeded with as much sales hype and in some cases misinformation as oil. Chemical engineering ain't my long suit: I have lots of company I'm sure. So! What's the best answer? Are bought and paid for studies honest? What lubrication requirements are unique specifically to the LT5 that might frame the decision/choices? Far beit from me to presume ro offer expert opinion or recommendations based personal expertise. But, it is possible, I think, to identify some of the most important things which distinguish the motor from some of those others with their pushrods and roller tappets, and limited rpm range, for example, The things that jump out at me and other students of the LT5's characteristics is: flat tappets, 7000+ rpm redline, long and numerous chains, smallish cam sprockets, viscosity srability of synthetic oils over extreme temperature change, the chemical makeup (features) of oils specifications at the time the motor was built. All this considered as well as recommendations from those knowledgeable people I and others trust, is how I came to settle on Amsoil 10W-40 recommended by Marc Haibeck. I'm more WARRIOR than WAXER. 7000+ rpm reached ea. outing is "normal". In it's 9th season now, and she runs like a fine watch. So far so good! I'll stick with what is working in the knowledge unique LT5 requirements are specifically being met...at least so it seems!