I know that for the LS400's it says PREMIUM unleaded fuel only.. but what happens if you just use 87 octane? does it lessen the engine life or what?

 

is this like the #1 discussed topic now because the gas price is high now?

read here, the verdict: don't do it

https://www.clublexus.com/forums/sho...d.php?t=354962

 

dont be a cheap ***! Use premium

 

Yea.. id stick with 91. Its only a couple extra bucks at each fillup.

 

Actually, premium, relative to the cost of regular unleaded, has never been cheaper. Since most gas stations still have a 10 cent spread between grades, percentage wise premium is only 2.5% more expensive than regular. It used to be 5 to 6 % more expensive than regular.