Originally Posted by
pizzaguy
I agree with essentially all of this. In fact, I attribute the advent of technology's role in the formulation of modern synthetic oil to why I not longer preach heavy (40 and 50 weight) motor oils. Back in the 70's and 80's, I used 15W40, 20W50 and even 30 or 40 weight oils in most all engines. Back then, I never would have envisioned putting 5 or 0 weight oil in an engine! But today, all the motor oils I use are 5W40 (Crossfire) or 10W40 (Ford Ranger).
Today, the products we are putting in our engines are, I believe, superior to what we had 40 or 50 years ago. Dave, (180) would you agree?
I agree, back in the day we would put heavy oils in the engine to quieten it down and reduce the blue smoke coming out the tail pipe when it was worn out and had sloppy rings and bearings. Some crooks put heavy oil and fine sawdust in the gearboxes to quieten them down as well.