I know this is a little off subject but can apply to older trucks. I read a subject somewhere that ATF fluid was better for cleaning injectors on older model diesel eng. I know we dont wont to run in VP44 will cause damage. Is there any truth to this? And new trucks with particulate filters is a big no no with any type of oil. (right) The reason I bring this up is I have a 1974 model 4030 John Deere and thought about the 35 year old injectors in this tractor.