Must be another different aftermarket manufacturer using whatever thread they saw fit. Nothing like making it difficult. Haha. I found a Dorman oil drain plug with M12-1.5 thread, I cut it down to the proper length, removed the crappy washer it came with and added a rubber o-ring under the head. It ...

IMG_5264.jpeg So, small update to what I’ve found….. The threads on the drain plug for the OE rad are in fact M12-1.75. However, the threads in the aftermarket rad are NOT M12-1.75. After reading your post, I sourced a M12-1.75 plug locally for this aftermarket rad and tried to put it in. It tighte...

I appreciate that! But I’m in British Columbia, Canada, so I’m sure the shipping wouldn’t make sense. Thank you very much for the info though!

I have the exact same issue, and I’m sure the top plug is from an aftermarket rad, and here’s how I know. I bought a new aftermarket rad from a local auto parts store and installed it without an issue. However, after filling up the system with coolant and running it, I noticed a VERY slow drip formi...