This is why I have gone beyond the Penzoil Ultra Platinum for my oil. I go with Super Ultra Mega Pure Jadeite Fortified Oil for my cars. The most pure and most best oil that you can ever have. It's so good that when I did the blackstones on it, they tell me to send the old used oil out of my cars to people that have wear issues. This is because it adds material back to all lubricated surfaces, thus brings back old engines to life. I'm ready to start a malware marketing program that will show everyone out there that this is the best.
Ummm....what? What nonsensical bovine scatology is this?
Well, that would be funny IF I used Blackstone.
Nope. You wouldn't have a perceptible difference from Ultra to Platinum or any other oil, even if the viscosity you used went from a 5w30 to a 0w20. There are MANY variables to fuel economy, but brand and viscosity of oil can only get you very slight changes that I'd argue are not perceptible by the seat of the pants.
You do not need to recalibrate the stock wheels on sports and Rubicon wheels take off ( 285/r12/17) . There is so small difference. This has been mentioned many times in this forum including me - See my profile.
I think you'd be wise to recalibrate your speedometer if for no other reason than to accurately track the miles you've put on your Wrangler. That's a disclosure violation if you sell it to someone else or trade it back in. I understand it's minor, but it is still inaccurate. If off the lot you were to put on Rubicon takeoffs your speedometer is off by 3mph at 80 mph. You're going 83 when it looks like you're going 80. I like to drive about 9 over the speed limit so if my speedometer said 79 I'd probably be closer to 82 and more likely to get a ticket. I know, I could just 'remember' and mentally recalibrate, but my wife wouldn't know or remember to do that. Additionally, if you were to trade it in at 100,000 miles, you've actually put 103,750 on it. Just something to think about; I'm not here to tell anyone what to do or what's best.
