I have a 96 navara d21 with a 98 turbo engine and box. A couple of weeks ago I noticed alot of blow by and then a week later it shot oil everywhere mainly out the breather into the air box and from there into the turbo. Now it runs but very rough and smokey even after cleaning up the oil. I have now been told that it is most likely cracked piston or broken rings but talkin to a reco engine shop they said that this model motor have problems with overheating the block and warping it. Has anyone had the same issues or any ideas?