I was running 15-40 oil in everything. I'm thinking about going back to 30W as the manual says.
Take the tunnel cover off and check the drive line. Diesels are hard on them. Grab the drive shaft (it's best to have the engine turned off) and see if you can move it side to side or up and down. If you can or if the tractor has a lot of vibration at full throttle stop there. I would change it all out for about $150 and not have to worry about it again.
I would also change the transmission fluid and filter.
If you are replacing the fuel filters I would also replace the fuel lines. They are cheap at any auot parts store.
That should be a good start and there will be plenty more to check.
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