So what are the best multi engine written and/or oral study guides?

I've seen different books, of course the Jepp manual and a couple of others like one written by Gardner and one written by Robson, both are ASA guides.

Any recommendations?

I use the ASA multi oral guide along with the Jepp Multi Text.

use the faa "flying light twins safely"
also use the jepp multi engine flying book

most important....use google, its free or just ask questions there are unlimited MEI's on this forum as well as people with thousands and thousands of hours of multi willing to help with questions

I used the ASA Multi oral guide.

I also recommend anything Jepp....

many thanks for the info.... much appreciated

it sure is nice to have a forum

I used the ASA guides...worked fine. I personally cannot stand Jepp, but like 99% of other pilots seem to like that...lol. So try that...

Been using the ASA Multi-Engine Oral Guide myself. Checkride for the PP-AMEL add-on is hopefully next week