Any noise accompanying this flashing light? How’s the consumption. We often construct a dinosaur’s head from a pig’s tooth here, so let’s really get the picture a bit more into focus before writing this off.
I already know you’re not going to do any internal engine work. You’ll find another beater.
If you want the cheapest approach, grab heavier oil. NO - IT’S NOT THE PREFERRED WAY TO NAIL THIS DOWN, but given the immutable physics of your wallet, outside of a bad sender, you’re screwed anyway.
If you use a 30 weight, go to a 40 weight. Escalate as needed.
You’re in tactical mode. No strategy allowed. Good luck.