I remember reading this thread when i first signed up, thinking 'gee i hope i dont ever have to post up in here' oh well, here goes...
Engine/Car: RB25DET/S1 R33 GTS-t Skyline
Type of failure: Detonation/Ringlands on all 6 pistons
Factors influencing the failure: Detonation - possibly timing too advanced, my car had a tuned power FC when the previous owners had the car (when dyno in my sig was done), currently has stock computer, im pretty sure the engine had the problem when i bought it, i havent covered many ks (only about 10000)
State of tune of the engine: Internally stock
Suspension and tyres: tanabe coil-overs, replaced bushes, front strut-brace, nankang 235/45/17s
Oil used and service interval: 2 changes on my behalf every 5000ks using motul turbolight
General comments: problem was most likely incurred by previous owners, i had a mechanic check engine over when i bought the car, but it wasnt the most thorough check, i noticed the engine bay was a bit oilly but i didnt stress too much cos i got the car for a really good deal, also has an oil catch can, that will fill (found out later) up rapidly at higher speeds, it recently started using about 1L of oil per 1000ks, so rebuild is in process at the moment.