local function bezkierowcy(veh)
    local occupants = getVehicleOccupants(veh)
    local seats = getVehicleMaxPassengers(veh)
    if (not seats) then return true end
    for i=0,seats do
    local occupant = occupants[seat]
    if occupant and (getElementType(occupant)=="player" or getElementType(occupant)=="ped") then
        return false
    end
    end
    return true
end


for i,v in ipairs(getElementsByType("vehicle")) do
    if (bezkierowcy(v)) then
        setVehicleDamageProof(v,true)
    else
    if getElementData(v,"damageproof") then setVehicleDamageProof(v, true) return end
    setVehicleDamageProof(v,false)
    end
end

addEventHandler ( "onVehicleEnter", root, function()
    if getElementData(source,"damageproof") then setVehicleDamageProof(source, true) return end
    setVehicleDamageProof(source, false)
end)

addEventHandler ( "onVehicleExit", root, function()
    if (bezkierowcy(source)) then
        setVehicleDamageProof(source, true)
    else
        if getElementData(source,"damageproof") then setVehicleDamageProof(source, true) return end
        setVehicleDamageProof(source, false)
    end
end)

    local vehTimers = { };
    setTimer(
        function ( )
            for _, vehicle in ipairs ( getElementsByType ( "vehicle" ) ) do
                if getElementHealth(vehicle) < 260 then
                    setElementHealth( vehicle, 250 ); -- set vehicle health to "fire" health which is ~250
                    if not vehTimers[ vehicle ] then -- if we haven't set the timer 1 second earlier then:
                        setVehicleDamageProof( vehicle, true) -- it only need to be called once so set the bulletproof property
                        vehTimers[ vehicle ] = setTimer( setVehicleDamageProof, 120000, 1, vehicle, false); -- 5mins = 5 * 60sec = 300sec = 300000ms! It's NOT 500000ms
                    end
                elseif vehTimers[ vehicle ] and isTimer( vehTimers[ vehicle ] ) then -- if we set a timer earlier but the vehicle was repaired within the 5mins then:
                    setVehicleDamageProof( vehicle, false) -- disable bulletproof property
                    killTimer( vehTimers[ vehicle ] ); -- kill the timer
                    vehTimers[ vehicle ] = nil; -- remove the variable from the memory since we killed the timer and it's no longer timer variable
                end
            end
        end,1000, 0
    )