There are people out there in this world that can convince people of anything. They are good con people. Then you have other people who back theses cons and call them demi-gods like Cramer did. When this happens you have amazing gullible people who have no clue piling in and buying a worthless stock like this. I want to meet the person who paid $177 for this nine short years ago. This stock has huge loses and that's going to continue.
DE is more affected by grain/corn not by the other things so much. CAT is much more affected by the other things you mentioned. They are both hurt by the strong US dollar. They are doing a good job.
The only thing I worry about is electric cars coming on, Most oil goes into gas powered cars and that worry might be part of the decline. Buffett is buying PSX and that's a better play, If I just owned some COP I would hold on. You never want to hold tech companies at his age NEVER. Buffett has avoided them during his career for the most part.
Well Buffett doesn't own any oil company but is currently buying Philips 66 which has a good dividend and benefits from cheap oil. I worry about electric cars coming on big and that will hurt oil companies. Just make sure you diversify across many industries and don't put too much of your money on one stop. WFC is Buffetts top holding and has a great dividend. If it comes down more that might be one option.