Hi guys firstly I’m new here and new to the car community. I have a BMW e30I wanted to swap its engine since it got seized. A lot of people suggested me to do a 2jz swap but no one told me which one to buy And I swapped my e30 with a 96 non vvti 2jze N/A Now I want to know if it’s worth it can...

Ok so just recently I have had a bubbling sound coming from the middle of the engine. I have checked the fluid levels and filled them all up And it is still there. Do you guys have any ideas for how to fix it.