Motech also brought its aluminum block 5.3L V-8-equipped JK Unlimited to the photo shoot. While this feature is about their 6.2L LS3 Wrangler, I liked the 5.3L’s license plate and stole it for the feature title. The 5.3L JKs use the OE radiator and exhaust system, saving lots of money. The 5.3L runs cool and the stock exhaust scavenges fine. Motech is averaging 20 mpg with the 5.3L and 6L80 in this otherwise stock JK Unlimited.