I have a car ('96 Lexus ES 300) that's been parked non-operational for over eight months, except for one drive down the block last month (it started up just fine). It's in Los Angeles, so not too much cold or humidity. Outdoors (not in a garage). I did disconnect the battery before parking it, but I did not put in fuel additive (I didn't learn of the need to do so until just recently). The gas tank is about 1/4 full. I still don't need to drive it, and am not really sure when I'll need to, but it will definitely remain in storage for at least "months."
I understand that the best way to clean up the fuel system of a car stored this way would be by topping off the gas tank with new/clean fuel, and running Sea Foam through it (per Reviving a vehicle that has been idle for a long time).
My question: at this point, now that it's already been sitting for 8 months sans-additive, does it still make sense to add STA-BIL before letting it sit even longer? Or the fuel has already oxidized at this point, so I should just leave it as-is & use the Sea Foam once it's actually time to drive it again?