- Joined
- May 17, 2022
- Messages
- 20
This is an interesting quote regarding OEM recommended oil.
The link to the full article is attached at the end of the thread.
"Do a web search for "Hemi camshaft failures," and you'll find a few thousand photos of gouged cam lobes, most of them the result of lifter failures on MDS cylinders. Because this author's wife dutifully changed the full synthetic 5W30 oil every 5,000 miles over the Hemi's 235,000-mile life (that's about $4,000 worth of oil changes!), this bumpstick looks pristine for such a high-mileage unit. This one passes inspection and can go for another 100K miles. Folks, on an MDS-equipped Hemi, it's vitally important to use the right oil and viscosity at the right change intervals. Not doing so risks contaminating the oil and blocking the lube circuit into or out of one of the MDS lifters, causing it to not lock or unlock the plunger. Higher viscosities than 5W30 also cause the plunger in the MDS lifter to delay the locking action until the lobe's clearance ramp has ended and the lifter is on its way up, eliminating the important cushion provided by the plunger's hydraulic lash."
I think I'll stick with PUP 5w20...
Article here https://www.motortrend.com/how-to/hemi-engine-problems-2011-dodge-challenger/
The link to the full article is attached at the end of the thread.
"Do a web search for "Hemi camshaft failures," and you'll find a few thousand photos of gouged cam lobes, most of them the result of lifter failures on MDS cylinders. Because this author's wife dutifully changed the full synthetic 5W30 oil every 5,000 miles over the Hemi's 235,000-mile life (that's about $4,000 worth of oil changes!), this bumpstick looks pristine for such a high-mileage unit. This one passes inspection and can go for another 100K miles. Folks, on an MDS-equipped Hemi, it's vitally important to use the right oil and viscosity at the right change intervals. Not doing so risks contaminating the oil and blocking the lube circuit into or out of one of the MDS lifters, causing it to not lock or unlock the plunger. Higher viscosities than 5W30 also cause the plunger in the MDS lifter to delay the locking action until the lobe's clearance ramp has ended and the lifter is on its way up, eliminating the important cushion provided by the plunger's hydraulic lash."
I think I'll stick with PUP 5w20...
Article here https://www.motortrend.com/how-to/hemi-engine-problems-2011-dodge-challenger/