I've got a 2017 LS3 stock standard. It's lucky to do 5k per year.
I've been changing oil every 6 months regardless of km.
Thinking of doing it annually due to the low k's
Should I just suck up the extra dollars as insurance against longevity or am I just draining dollars every six months?
There are places that will do an oil analysis so I’d talk to a company that does such and discuss the types of tests they can do and how much it costs. Interesting tests would be on contaminants, shear, viscosity, remaining additives left (probably an important one) etc.
Then if costs are not crazy, the most definitive answer would be to get the oil tested @ 6months/2500kms. If the oil test shows it’s ok, no contaminants with correct shear and viscosity and additives still within oil, leave it in the engine and then test again after another 6 months (oil now 12 months/5000kms old). Again if the oil test shows it’s ok, leave it in for another 6 months (oil now 18 month/7500kms old).
Now we get to the interesting bit, if it’s still showing as ok do you leave it in and test again at the 24 month/10000kms mark? Probably, may be not... But you’d have a definitive answer.
If you do go down this path, post test results at each step (along with driving habits) so the rest of us slackers will know the best oil change interval for our low usage vehicles
we’d owe you a bear or few
PS: as to driving habits, if oil gets to temp and stays there for 10 minutes, I’d suspect any water and other low boiling point contaminants to boil away and exit the engine, thus keeping oil in better condition. I suspect it’s lots of short drives where oil doesn’t get up to temp that cause oil degradation and thus engine issues.