Never blew an engine but blew a turbo with only 20k on it in my Forester XT.
Factory turbo was replaced under warranty at around 60k miles due to oil getting past the seals. I started pushing my intervals with the new turbo, despite Subaru of America cutting back on the original 7,500 mile OCI (normal service) and mandating all turbos to fall under the 3,750 mile severe service OCI due to AVCS and turbo banjo bolt filters getting clogged.
After I loaded up the car for a trip from NJ to SC at around 80k on the car, I noticed a ticking sound from the engine. I thought it might be from using a different oil filter, and didn't realize it was actually the sound of a clogged banjo bolt filter. I decided to take a chance and make the drive and somewhere around DE/MD, my check engine light came on and I read the code with my code reader. It was a P011 and P021 which basically confirmed a clogged banjo bolt filter.
Called my dealer and spoke to my tech (the only one that worked on my FXT) and he said it's likely turbo failure and that I would probably be fine continuing the trip. Of course, it started burning oil badly and smoking up the interstate and I bought whatever xW-40 oil that I found along I95. On the way back the oil burning increased as well as the smoke. At a rest area, a guy asked if that was my car smoking on I95 and he said it smelled like gunpowder.
My apologies to the environment. I did make it back home though.
I put over another 100k on that turbo despite still running all banjo bolt screens on the new turbo. It was a popular mod at the time to remove them. The dealer tech convinced me to leave them in because he felt the benefits (keeping debris out of the turbo) outweighed the risks of another failure. Cutting my OCI to 5k running mainly Euro oils probably helped as well. Sold the car with over 190k on it after I got rear-ended and the car was totaled.