I have a 93 z28 with a 96 lt4 swap that is leaking about 3 quarts of oil every 200 miles. I have replaced the intake gaskets, valve cover gaskets and every seal related to the timing cover, opti, and water-pump and have verified that it is not leaking from any of them. I also replaced the oil pressure sender and verified it is not leaking as well. The only thing that I can think of that I have not replaced is the rear main seal and the oil dipstick tube. are there any other places that might leak that much oil under regular driving conditions? I plan on driving it to Daytona in November for the rod run and do not feel like dealing with buying oil at every auto parts store within the 800 mile trip one way. I know that there are older threads that are similar but other common leaks may have shown up in the 12 years since those threads died.

 

If its puking 3 qts of oil every 200 mi...I would think the source would be clear as that is a huge leak. Clean the engine (read without soaking electrical items) and buy an oil leak dye kit. With the goggles and black light included in the kit you should quickly see neon green at leak source. Best to be in darker condition when using the black light

A "guess" could be oil filter adapter gasket or oil cooling lines if external cooler. If its RMS and a stick car, that kind of oil leak will kill the clutch disc quick

 

It’s an a4 car, and an oil cooler delete, I’ll look at the oil filter adapter and in the bell housing ( both are absolutely covered in oil from previous leaks) and then run it and look for the culprit. I’m hoping it isn’t the rear main because I really don’t feel like dropping the transmission

 

Also could oil type cause worse leaks. I’m currently running 10-30 synthetic Blend but plan on going back to conventional

 

You beat me too it.....there should be a huge puddle somewhere under the car.

 

I was just under the car, there is no oil filter adaptor on the motor, the oil filter goes straight to the block. I just re checked the intake and valve covers and it’s all still dry. It looks like oil has been getting slung around by the torque converter in the bell housing so I am assuming it is the rear main at this point

 

RMS leak is not common as they typical rear intake let alone WP drive seal...but possible. especially if flex plate weight was thrown off but in that case, you would have a significant engine vibration.

Some degreaser and pressure washer would clean the area so you could see the source better....but your leak amount is huge so I suspect you should be able to see from where

synthetic oil is "thinner" than dino but in your case, given the huge amount of oil loss, it is not the cause

 

My stupid 07 Prius burns a quart every 1000 miles. With synthetic it burns a quart every 500 miles. 3 quarts per 300 miles is excessive. I'd say your motor is consuming it. Afterall an Lt4/6spd combo was a recipe for abuse. Or your greatly exaggerating.

Coincidentally, I also just installed a leaky LT4 into my A4 Trans Am. Replaced all the seals and eliminated the oil cooler. Pull that transmission, you could do it in 6 hours.