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I know; it sounds insane, but it is absolute trash.

It turned out to be a poorly manufactured brass fitting on my bottle. Tons of little bits of brass in its bore. -DT

Thank you! This place is amazing. I've been wanting to write a deep-dive on it.

I'll check. I do wonder if that brass hose fitting is just... disintegrating. I've heard GL5 can do that, but MOTUL denies it, and it doesn't really pass the sniff-test that it would happen THAT quickly. -DT

It's not air; these things are tumbling down the tube in a way that air doesn't. Here's another video.

I realize that headline is ignorant, but look at this: I've got MOTUL 85W95 GL4/GL5 gear oil in a bottle upside down; there's a brass fitting with a tube on it feeding my differential. Surely that GL5 isn't disintegrating that fitting that quickly, is it? I'm so confused.

It doesn’t burn oil. But I wonder: Is there really THaT much zinc in this stuff? Is there any way to tell what is in it short of a voa?

Hi, I have a 1991 Jeep Wrangler YJ with a 4.0-liter straight six. I just passed California emissions (I live in SoCal) by the skin of my teeth, so I wanted to ask if using this: https://www.beausautoparts.com/products/fram-15w40-heavy-duty-synthetic-blend-diesel-engine-oil-f545-1g?gQT=0...

The owner's manual says nothing. But I'm told a sticker on the engine says 0W-30.

I own a 2021 BMW i3S REX, meaning it's an electric car with a small gasoline generator that cuts on once my battery has depleted to give me an extra 80 miles of range before I have to fill back up. These range extenders are often a cause of concern because of just how infrequently they're...