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There is a very detailed discussion of it here: Oil refresh mode - analysis and solutions

TL;DR: If adding fuel doesn't help, drive for 10 min to warm up the engine and drain the battery a bit, then idle in your driveway for another 5-15 min, which will let the oil heat up past 100 degrees Celsius. That should exit the mode. There are two things that can trigger FORM, stale gas, or the computer believing that there might be condensation in the oil (which it then wants to boil off). Just driving doesn't usually allow the oil to get hot enough because of the air passing through the radiator, so the idling is key.
The Oil mode also tracks oil dilution due to blow by from the engine running but the oil not reaching normal temperature. I just had form for the first time on my 2021 Hybrid. The tank had been filled about a month ago so I figured it must have been oil related. So I put the fam in the van, loaded up on snacks and went for a 30 minute drive. That fixed it.
 

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Interesting! On my 2017 it only went off after I idled it for a while. That was in the winter too, might be different if it was warmer outside.
Ya the earlier Hybrids seemed to have issues getting the oil hot enough in the winter to satisfy an oil refresh. I think you need to get the oil over 80C for 15-20 minutes. My 2021 oil temperature would go that high at highway speed even at -30C. So they must have changed something with the later models.
 

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Pretty sure the service manual states refueling the vehicle will not change FORM status. Resetting the oil change light will but it's expressly stated -not- to do that. The idea is to get the juices flowing in the engine and burn out the tank to prevent stale fuel. Really should just let it go until it finishes itself. Trying to bypass it really doesn't make sense.
2021 Hybrid Supplement page 37:

”If the vehicle enters Fuel and Oil Refresh Mode, due to fuel which has been in the fuel tank for a long period of time (becoming stale fuel), the engine will run whenever the vehicle is operational (no electric only operation) until the low fuel level warning is activated. It is also possible to exit the Fuel and Oil Refresh Mode sooner by adding a minimum of four gallons of new fuel to the vehicle’s fuel tank.”
 

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I think the key word is "possible" there. I've seen reports of people adding plenty of fuel and it doesn't leave FORM. I believe it's also to condition the oil in addition to the fuel?
Yes it’s there for fuel, oil, and apparently spark plugs as well. But FORM can trigger for any or all of the conditions. It would be nice if it told us why it was activating. I just had it for oil. The fuel in the tank was at 3/4 full and only about 1 month old, and FORM started, so I figured it must be oil. We drove enough to bring the oil over 80C, then another 15-20 minutes of driving and FORM ended. Probably the best strategy to get out of FORM when it activates is to immediately add 5 gallons/19 L to the tank. (I say add a little more than required to account for measurement inaccuracy) If that doesn’t end FORM you can assume it’s oil based and you need to get the oil up to 80C or so and keep it there for 15-20 minutes. That can apparently be tricky in very cold weather for pre-2021 models. My 2021 never had a problem warming up even in very cold weather.
 

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My tank is full. Yes daily drive,60-65mls.
But have you added gas since FORM started? You have to have add the equivalent of 4-5 gallons since FORM started to satisfy the fuel requirement. And to satisfy the oil requirement you have to drive a fully warmed engine (oil temp over 80C) for 15-20 minutes straight. If your tank was already full when FORM started then you have to burn out 5 gallons and then add that back in. That’s why I don’t recommend you keep your tank full if you normally only drive in EV mode. That way when FORM starts, you can put some gas into your tank to get rid of FORM quickly.
 

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I bet oil part of FORM is to protect the engine if you decide to floor it. My ICE goes high revs right away! A couple of months of no oil pressure might leave the camshafts dry.
Not directly. The oil as specified for this engine keeps parts thinly coated for a long time. And this engine has a variable pressure oil pump. When it starts cold it provides oil at higher pressure (75psi) to rapidly coat the engine components. After a couple seconds oil pressure returns to 30psi.

But FORM does protect the engine by preventing stale fuel, and preventing excess oil dilution by moisture and blown-by hydrocarbons. There is also a time based spark plug metric the computer is tracking, but I don’t specifically know what the details of that are.
 

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Only 36 mls electric a a day. Gas in the tank what the dealer put in. April 28 2022
Yes that’s your problem. You manual explains what FORM is all about. Basically you need to drive enough that you can put 4-5 gallons back into the fuel tank. This is to prevent problems with stale fuel or differences in seasonal fuel blends. In the future I’d recommend you keep your fuel tank low unless you know you’re driving long distance. That way when FORM starts you can add 4-5 gallons to the tank right away to get rid of it. See the Hybrid Supplement for more info on FORM mode.
 

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Has anyone tried siphon out 5 gallons, start the car so it knows 5 gallons has gone by and then put 5 gallons back and see if it gets out of FORM? Just curious....
I bet that would work. You’d probably have to take it out. Start the van. Shut it down. Put the fuel back in, and then restart it. It’s probably comparing fuel between starts to satisfy FORM or something like that.
 

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The system looks for fresh gas being put into the vehicle. You can try to cheat the system all you want, but don't complain when your vehicle starts acting up because of the stale fuel. The risk is yours to take.
Ya I certainly don't endorse any of that. I endorse keeping your tank lowish until you need fuel or until FORM starts.
 

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2022 Pinnacle hybrid, I ran it in FORM for a week, filled it up with 9 gallon fuel last week and it went away. Now I have driven only 100 miles (all electric) and it came back again in just 4-5 days. Its annoying.
That could be the difference between FORM for fuel and FORM for oil. During that week of FORM did you ever drive it long enough to get it fully warmed (oil temperature at least 80C) and then drive another 20 minutes or so at that oil temperature?
 
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