I'm a long time Fram Ultra user on multiple vehicles including the truck in sig. After experimenting with many different oils and filters, it "seems like" this truck is happiest, quietest with Mobil 1 EP. Always used a FU so i didn't give that a thought. 2 oil changes ago I picked up a noise similar to a mild piston slap approx 5 seconds after startup. This was right after the oil change. I figured its age of the engine, and that piston slap or some mild ticking is common on these engines. But not this particular engine. She's always been quiet at startup. I had been wanting to use the Fram TG on the shelf at some point, so I tried a hot swap half way through the OCI. Noise gone!!! I assumed it was coincidence, my beloved Ultra could not be the cause of the startup delayed noise. So, went back to the Ultra last oil change. The noise came back, ughhh. Can't be the filter, this makes no sense. Bought another TG and installed it on yesterdays oil change. Gone again!!. Quiet as a mouse. So, I guess I will be using the TG for now on.
No autopsy, but I did take some pics of the FU freshly removed from the truck after a 6800 mile (OLM 2% left) OCI. I also took a similar pic of the TG that went in and was quiet. Anybody see anything unusual? I usually check filters after an OCI, don't remember seeing so much screen covering the holes..
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