V50 2.0 – gears can be difficult to install with heat

Hi, Since it has summer temperatures, with my V50 2.0l petrol tank (60.000km) the problem arises again that it is difficult to insert in the stand of the 1st or the R-speed – and this especially in a warm condition. As soon as I can let the car roll a piece, it works better. If the engine is switched off, I can insert the two gears without difficulty. All other gears can be switched normal and even at low outside temperatures I have hardly any difficulty I have already tried the SuFu, but the problems are probably more common with others at low temperatures. Could a gear oil change or adjustment bring an improvement to your opinion or is that again only “state of the art” at the V50? Greeting famai