early last year i bought a 2016 frontier 5 speed auto trans, V6 engine. iam much happier with it than i thought i would be. it had 45,000 miles when i bought it. it has 60,000 on it now. i just had the trans and rear end fluid changed. i once knew a guy that put thicker oil in his race car trans. that seamed to work fine for him. i never could under stand why such thin oil was used in auto trans. what think?