Thoughts on Oil drain valve.

[Hilal]

I'd rather a magnetic sump bolt to remove any shavings inside my engine to prevent engine damage.

[rgvlee]

At a minimum I'd be lockwiring it so there was no chance it could open, can appreciate the use of a hose clip to lock it in but I wouldn't trust it. Personally I'll stick to a sump plug.

[wai]

I'd rather a magnetic sump bolt to remove any shavings inside my engine to prevent engine damage.

Filings in an engine sump is not a problem. Those filings will never pass through an oil filter. The only oil that is pumped around the engine has been through the oil filter. Basically, if you drain the oil with the engine warm, all these filings will be flushed out with the old oil. Even if they remained in the sump, the they would never get into the oil galleries as the oil filter would trap them.

A magnetic sump plug for a gearbox or diff is another thing altogether. They do not have a pump system or filter and rely on the movement of the gears through the oil to distribute the oil. Even so, when foreign bodies cause a gearbox or diff to fail, it is because of something far more catastrophic. Basically, when they fail, and all the bits that failed would be stuck to the magnet letting you know exactly what caused the failure.

[wai]

At a minimum I'd be lockwiring it so there was no chance it could open, can appreciate the use of a hose clip to lock it in but I wouldn't trust it. Personally I'll stick to a sump plug.

Which defeats the whole purpose of it, as if you can get to it to lockwire it or remove the lockwire, you may as well just have had the drain plug there in the first place

[rgvlee]

Not necessarily, lockwire doesn't take long if you know what you're doing (I do it all the time on race bikes).

One of several points of this particular system is to avoid having to tool the sump plug so it has an advantage over a bolt. The other is time, it's easy to open/close a tap compared to loosening/tightening a bolt where if you are ham fisted can go pear shaped pretty quickly.

There are pros and cons for it, personally I'll stick to an ordinary sump plug.

A magnetic sump plug will quickly and easily highlight if you have debris in the oil, so while that may not go through the engine it could alert you to a potential issue.