Ok so when engine oil level gets low the gear shifter gets sticky but when you add engine oil it will shift smoothly. Between oil changes I have to add a quart and a half of oil. Where is it going no leaks visible
So you believe your eng. oil is affecting the way your transmission shifts? Really? Have you checked your trans. fluid level?
And you lose almost 2 qrts of eng. oil between changes? Not abnormal for a high mileage, worn out eng. How many miles do you drive between changes? Is it leaking it on the ground, or smoking out the tailpipe? I'm guessing a little of both. The only other place your oil could be going, (if it's not the previous 2), is in the oil pan. I'm sure you would know that, if it was.
Welcome to the club. Will be waiting for a response.