I have a 1989 Toyota truck with a 3VZ-E V6 engine.It has 320K of milage on it.I have been using Castrol 20-50 Dino and burn 1 quart every 3K.Oil changes are every 3k also.This motor has never been apart.Would Auto RX help this engine or should I just leave it alone.Is there anything else that I should consider doing to clean it out. This model and year has been flagged as a gross polluter in California and I must take it to a smog test only station which is very strict. Thanks for any suggestions in advance.