I dont want to depend on others to fix my vehicles for me. I purchased a 2004 Mazda 6 a few months ago and was stoked because i finally had the means to purchase my dream car and it really didnt matter what anyone suggested at the time, i wanted that car. When i went to get it smogged, it failed due to the engine light being on. that pointed towards the cats needing to get done b4 it would pass I have not been able to afford such a job as that so ive sorta been trying to baby it since. its been about 3 months maybe 4 max. there hasnt been any visible or obvious issues untill one day, it started shifting super hard. jumping from first to second, whirring from second to third and clunked HARD from third to fourth. I changed the transmission fluid and added 1 bottle of lucas additive. After a few days of shifting the same as b4 the tranny fluid change, all of a sudden, as quick as it came, it went. it shifted smooth for the most part. i did notice that the fans seemed to be dramatically louder than when i first purchased the vehicle but there was no damage to anything that i could see upon opening the hood. so last week, my oil light came on. when i got to where i was going, i checked it to find it bone dry. So i got a ride to get a jug of oil. My poor car was thirsty af. It took the entire bottle. Now, i just got off work today and when i was most of the way back, my oil light came on again. I stopped to check the fluids to find it bone dry again. i dont know what my issue is if anyone has any even mild suggestions Id appreciate it very much. Plz help me fix my car.