It is posted on Tom's web sight I just copied it for you! It is fine to use the brand "Lubri Matic" but not the so called 'GREEN BIOBASED LUBRICANTS" that Lubri Matic sells. Like I said you can use the Lubri Matic White Lithium Grease they make without any problems!
http://www.shoeboxcompressor.com/forum/showthread.php?188-*****-Do-NOT-USE-these-Lubricant-Brands-with-ShoeBox-Compressors*****