Was reading on changing out transmission fluid and how often so........

How often do you guys replace motor oil and filter? Every 3000 miles? 5k?10k? higher.

I do.Much higher. Mine is replaced every 25000 miles (h2) with filter changes every 12500 miles. I run amsoil and have for years. Some people say oil is cheap insurance. I say true, but not necessary.
I have done extended oil changes for 10 years now. I have done as much as 35k between oil changes on previous cars

So what do you do?

 

I usually change oil and filter about every 3500 miles.

 

If I did that I would be changing oil once a month

 

I change my oil when my truck tells me to. I use Mobile 1 and so far it's been over 6k miles.

 

Your truck does not say that. It just counts down the miles (at least on my H2)

 

25k -35K ... Are you talking about transmission fluid only right????

If you do 25k on engine oil changes .. My friend you are either insane or you hate cars

I do mine every 3500-4000 miles or before any longer trip (1000 miles)

 

It is 25k oil changes and no I am not insane. I have done this for 10 years and probably half a million miles total.
What is insane is to change every 3 1/2 thousand miles. That is what grandpa did. Time for you to read up AMSOIL - Signature Series 100% Synthetic 5W-30 Motor Oil (ASL)