As an Auto Service Advisor ,I am aware of the suggested oil change specifications. What I'm saying is, my 77 Nova/305/auto went for 190,000 miles before changing differential or transmition oil and 10,000 miles between motor oil changes.This vehicle does not burn oil,and has not even been cracked open for lifter noise or timing chain.Now theoretically,I ask,if I changed these oils today,should it not be okay to continue on this path?Lets face it,it does not hurt to change oils more often, but the running gear has outlasted the rest of the car.The lubricants of today are so much better than the petroleum products of yesteryear, have we been brainwashed into thinking we need to change lubricants more often than nessecary?The vehicle I had before this was a 77 350/4 speed Camaro,I drove it for 48,000 miles ,same scenario ,the tranny blew 3 times because I drove it hard,but the mill and diff were fine.
