The coolant could be a leaky radiator/hoses. At 6 years old they could be cracking. The oil, that's not horrible to burn. You could switch to 5w30 or 10w30 and it may stop burning oil.
Your steering wheel is not death wobble. You'll know you have death wobble by the addition of something extra in your pants when you finally come to a stop. What you have is either tires that need to be balanced, need an alignment, or both.
Yes those tires will fit perfectly fine stock. Without spacers. If you want spacers however those are some of the best. The key to any spacer is maintenance. They need to be retorqued every 3-5k miles
"You didn't buy it to look at it!"
2000 TJ Solar yellow, 3.73, 178k, limited slip D44
2012 GMC sierra crew cab--Daily Driver
2008 jk X 6spd Red Rock---Sold and missed