I haven''t had any problems. This motor is a baby Vette motor. I live in an extremely hilly area, get 16mpg in the city and close to 30mpg on the highway. Beleive me, I miss my 99' and suprising those WRX and Evo guys once I got traction. The whine of my S.C. was one of the best parts about that car. But the internals are not made for all that horsepower as I blew my first motor. They are reliable as hell though when left alone.