Wheel loader purchase advice experiences

Hello am currently looking for a wheel loader Will one be from a well-known manufacturer to also get spare parts. Now the question is which one? I’m really important the motor etc makes fewer problems. Which deutz motor can you recommend or do you have yourself? Have already some internet sites by water cooled should not be so good. I only saw that the air cooled different ventiel covers have. Around oval etc, one can use the ventiel lid what z u say a motor. have read in a few forums that makes with the rounds least problems? Can you say that so flatly? I hope you can help me further, thank you