Thinking
Yeah... but luckily it got added before I went and looked. Saved me a 30 minute drive.
This is from the current 5.0 truck owners manual:
If you use oil and fluids that do not meet the defined specification and viscosity grade, this may lead to:
Ford has changed the 5.0 oil spec to 30 for 2021 because of the mandated oil change of G-5 to G-6 and they made changes to the engine. Primarily the lash adjusters and valve springs. But some geniuses take the change to mean the change is good for any engine.
If you use oil and fluids that do not meet the defined specification and viscosity grade, this may lead to:
- Component damage which is not covered by the vehicle warranty.
Ford has changed the 5.0 oil spec to 30 for 2021 because of the mandated oil change of G-5 to G-6 and they made changes to the engine. Primarily the lash adjusters and valve springs. But some geniuses take the change to mean the change is good for any engine.

This is from the current 5.0 truck owners manual:
If you use oil and fluids that do not meet the defined specification and viscosity grade, this may lead to:
Ford has changed the 5.0 oil spec to 30 for 2021 because of the mandated oil change of G-5 to G-6 and they made changes to the engine. Primarily the lash adjusters and valve springs. But some geniuses take the change to mean the change is good for any engine.
If you use oil and fluids that do not meet the defined specification and viscosity grade, this may lead to:
- Component damage which is not covered by the vehicle warranty.
Ford has changed the 5.0 oil spec to 30 for 2021 because of the mandated oil change of G-5 to G-6 and they made changes to the engine. Primarily the lash adjusters and valve springs. But some geniuses take the change to mean the change is good for any engine.

Same thing on these trucks.... you've got your 5W-20'rs and your 5W-30'rs.... doesn't matter what FoMoCo says. Hell, I've even seen guys on here using 10W-40 in mod motors.
Mine gets 5W-20, period.
Mine gets 5W-20, period.
What's getting said is just so out there now. Including all 5.0 blocks and specs are the same. They're not. The change to 30w in 2021 is based on engine spec changes around this adjustment because of new oil specs mandated for everyone in 2021, G-6. The problem I see is some may believe these idiots know what they're talking about.
Ohio. I hear you but like I said, this is new territory of B S.
Ohio. I hear you but like I said, this is new territory of B S.
Last edited by River1; Aug 19, 2020 at 04:37 AM.









