There has been some questions from the Engine Builders that they want to run a 50W oil. The “W” winter rate doesn’t really tell whether you can use a specific oil with hydraulic roller lifters as I have learned from both John Callies and Lake Speed Jr. What does matter is the centistoke number.

Driven has supplied this chart on flow ratings on the Driven FR50 and other popular 50W oils:

Ambient Temperature Oil Flow Rates
Oil Driven FR50 VR1 Brad Penn
SAE 5W-50 20W-50 20W-50
60F 328 cSt 786 cSt 627 cSt
75F 213 cSt 451 cSt 373 cSt
90F 144 cSt 275 cSt 235 cSt

High Temp Flow (for reference)
275F 9 cSt 9 cSt 9 cSt
300F 7 cSt 7 cSt 7 cSt

I have talked with John Callies at Morel about the Data above and he said the FR50 will work with the Morel lifters. For those that want to run a heavier oil you can run this with your Morel lifters.

Chris Straub,
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this is a quote from a friend

A few sets I retailed would only quiet down with cheap 5w-20. I'm done with them. The good cranes run quiet and last. With any oil.

I've seen this plastered all over the net today, and started really looking at Kinetic Viscosity. Which uses the cst number.

Question, why can't someone use another 5W-50 ? Their are very good oils out there that have 5w-50 designations.

I think preload is key to making these work

I would agree but.... I ran them at 1/2, 5/8, 3/4 and 1 full turn past 0 lash. Only thing that changed noise was piss water oil

and changing them out for some other lifter.

Since cSt is heavily reliant on oil temperature, let me guess, they'll want those using Morel lifters to run a certain maintained oil temp too........please.

That's seemingly been the fix.

7/8's is the sweet spot..........

Ditch the morels... run johnsons