What is this?

I was checking my oil and noticed this. Looks like something leaking/seeping out of a zerk maybe? Any help would be appreciated.

 

Yup, that's covered in The Megathread sticky.

Search for the word "Coolant" in that thread.

 

Coolant leak.

 

At least it's the correct color.

 

Yup. That's an engine.

 

from the "sticky"

• Coolant leaks: Three common causes: One is the is the gasket behind the thermostat housing, another is the coolant crossover at the rear of the block, and last but not least, old radiators is another source. Here's a list of things to check if you're losing coolant. For repairing the leak behind the t-stat housing, check this out. For the coolant crossover tube issue, you'll likely find coolant at back of the block, near where the trans and engine meet, check this reply for video/fix. This reply contains links to three other off-brand/odbball leak cases. For radiator leaks, this is one example of a tiny one - always replace with Denso brand radiator, and know different cab types use different sizes, careful where you order, scAmazon especially tends to deliver damaged products often (RockAuto has a spotless record with forum members). Proactive radiator replacement is wise. The transmission line routes through the bottom of the radiator ... go look up "pink milkshake", it happens in these trucks.

 

Ahh I see. I just had my radiator replaced a couple months ago by some shop (unfortunate emergency) so hopefully it isn’t the radiator… is that zerk meant for overflow? It looks like that pink milkshake which means bad news

 

It's the coolant tube that goes from the thermostat housing to the oil filter mount/cooler. You really have to tighten those hose clamps otherwise the leak. It's a goofy design.

 

There are no zerks for you to be looking for and it shouldn't be leaking or "overflowing" there. I wouldn't be necessarily concerned about the color of the coolant coming out. Looks like dried pink coolant to me. Definitely read the coolant thread links mentioned in the megathread.

Did they do your thermostat when they replaced your radiator, or did you have your timing belt replaced recently?