Originally Posted by digitonium

if you are unsure of the condition of the motor, do a compression test. Check or even replace the spark plugs.

If possible, check the fuel injectors.

Is the engine knocking or do you hear signs of rod knocking?

Yes, you definitely need an oil cooler since the day the turbo kit was installed.

with an oil pan spacer, expect to have at least 5 qts of oil added. Check the dip stick. Oil level should be between the h and l mark when engine is cold.