Did that for 35 years. Half of those years surrounded daily 100-mile commutes! Nowadays at 56 years old, I'm only entertaining home-office jobs surrounding telecom engineering and project management.Got 2 oil changes worth of the QSFS....It'll go in within the next 6 weeks probably. I always use the 5W-30....no towing yet, just back and forth to the work dungeon.
This reminds me... I need to accomplish one more round of fluid change-outs in my old Silverado, while I can outside. It needs engine oil and transfer case fluid changes before the snow sticks here (it snowed today but didn't stick). Soon!
Come to think of it... my AWD/4WD transfer case is all original, with approximately 205,000 miles on it! I figure that's a miracle given its constant use -- half the year -- in the AWD or 4WD positions. I hope its because I am somewhat religious about Auto-Trak II fluid change-outs.
I can tell you the auto-locking rear diff is NOT original (not as religious with that one). Oops.