^^^^Do this OP.^^^^Oil is cheap, cars are not. I have always been a 3/3K guy, and always will be. I see too many extended oil change pics here with varnished up engines. And yes, I do 3/3K with synthetic oil, which imo is no magic elixir. It's just oil.
I have been a BITOG member since February 2003. Way back then, up until now, I have always stated that I was a 3-6 month/3-5K mile OCI changer. Members used to somewhat chide me about it. 17 years later, it's the new OCI. Who's laughing now?
OP, maybe doing things the old fashion way might fix your problem.