So I bought the RC 350 in Feb. of 2020 used... a 2015 F-Sport with 39,500 miles on it and currently have 54k. And I have done a few Minor upgrades since I got it. The best one is the Remark muffler delete which makes it sound awesome! What a great product, and I understand it is very hard to find...because I spent like only $500 bucks for it.
And the next one is the RCF rims I found for sale...sold my OEM's and bought these for about an even money...can't beat that! But what I wanted to post is a very easy and important valuable maintenance upgrade for very little money.
I changed the Rear Diff Gear Fluid...such an easy thing to do and it is so important for your car. There are Videos on Youtube so look them up...or if you need specifics, you can message me(there are a few things can can make your life so much easier for this process). Max time is about 1 hour 15 minutes if you have your **** together...otherwise it could take you 2 hours max. *Also make sure you buy the Crush washers from Lexus! And don't re-use the originals! They are only like $8 for a pair. Check your drain plug to see how the much metal shavings are on it and down in the pan.

 

I always wondered why the Lexus Service Guide recommends replacing the diff fluid every 60K miles or 72 months only for F Sport Models?