I have the newest version of the traxxas rustler, with the gray plastic and the 2.5 engine. Engine has about 2 maybe 3 quarts though it total with proper brea in. Engine temps never exceed 230*F and will pop wheelies all day long. Truck is very quick and has never had a problem, only selling cause i need a parts for my revo. I will trade for a 3.3 engine with a manifold and 2 pushrods for a revo (the parts I need) other wise $150.00 with engine ready to run or 60 with out engine.