Hello everyone. I am new to this site, just heard of it and visited it for the first time yesterday...and have since been wrapped up in all the available information. GREAT SITE!!!!! I don't know as much about oil and fuel that I should an I know that I have finally found a resource that will boost my knowledge level. Anyway I have this question: I have a '66 Chevelle (big block, etc, etc.) The engine was rebuilt a number of years ago, very little milage was put on it, then into storage it went...and stayed there for a bunch of years...I am now getting back into the beast and bringing it back to life. Back in the day when I was running this engine I was told by a buddy of mine (one that has been helping me with the vehicle) to run Penzoil 20W-50. Which I did. Now that I am geting this car back on the road I am wondering what your opinions may be as to the weight of the oil. Is this heavy?