My uncle got my grandpa’s 300 back from the mechanic i don’t know how long ago it was I’m thinking a year ago hasn’t been up here since 2013. But anyway an issue that he told me about that I think everybody with a 300 4wd should know about is, that the guy had to pull off the head said timing chain and seals were shot and valve adjusters and lifters from what he told me where on the verge of needing replacing. He said the issue was from thick oil, then he said something about the transfer case was over filled and it blew that seal and oil leaked into the engine. The clutch plates were swelled up, axle bearing gone in the rear, the CV axles were shot and u joints.

But back to the oil issue if the oil leaked out of the transfer case and in the engine you got 10W-40 in the transfer case and 15W-40 in the engine, now can somebody please tell me how it would get so thick that it almost wouldnt pump good enough, I kept the oil changed regular and checked everything monthly, unless the oil in the transfer had more of something that thickened it up, idk but the oil on my finger was fine. The end total was 1,000.00 all together, I don’t neglect anything I take care of it, but the subject here is check ur fluids and if you have a 4wd atv with aftermarket foot boards that make it hard to get the your transfer case fill plug find a way to get to it