So I've got a RB26DETT which recently has being rebuilt making reasonable power, the initial problem was a bearing and the motor was rebuilt and the car was perfect for around 15,000 KM.
So I decided to check my oil and overflow bottle one night to my shock I had found bucket loads of black oil in my overflow and huge amounts in my radiator, so back down the shop I went and the diagnoses was the head gasket, which I thought was odd because the car just had a fresh metal one installed with the rebuild.
Anyhow the car seems fine initially after a new HKS head stopper is put in and I check the situation again with another 300-400km done, to see more oil being pumped up again into the radiator and into the overflow, also I think coolant was vanishing. So back to the workshop and we do a study to find on low boost little oil seems to be pumped up, but on high its clear and the motor's dip stick is low.
So the problem appears to be the block is cracked, now the block has had a lot of money and preparation and only pushed 400hp any around 15,000km, but it happens so a new block arrives.
So another new HKS head stopper is installed with other parts while the bottom end is done and the new block is installed with the power FC and tuned and the car makes good power and seems okay.
After 2500km I seem to think oil is being pumped up again and I see oil again in the overflow, this time we used some distilled water and it made a good combo with the oil. So we car travels to 4,000km and the oil is low and the car goes in for the service and change over. As a note I found after I got the car back it seemed to drink alot of extra coolant?
So the car is back around April 10 or so now I have traveled 2000km and the oil is now has dropped a noticeable amount of the dipstick and appears to have floated into the over flow and radiator a bit
Now: the head has being checked twice I pretty sure with the head gasket issue first and the second block
So the workshop thinks it may be something to be with the turbo? I thought they were checked first when the motor was taken out again though?
Note the turbos are HKS 2530'S in good knick
So all advice and opinions would be great to assist in my problem
Regards,
Clint