What weight motor oil for lube??

[whick1]

Hey guys if this has already been asked I am sorry but I could not find it anywhere while searching. I know that lots of you guys are using Mobil One Full Synthetic motor oil as gun lube for your ARs. I know that LAV and a few other guys whose opinions I respect use this method but I have not seen what weight you guys prefer i.e. 5/30, 10/30, 10/40, 20/50, etc. I am almost out of the gallon of LSA I purchased a couple years ago and the prices for the better lubes such as EWL, froglube, etc are crazy. I would really appreciate any help. Does motor oil provide decent rust prevention?
Also would motor oil be OK to use on Glocks and Remington 870s which are my other 2 duty weapons. Thanks guys.

[markm]

Depends how warm your area is. I've used 5/30 and 10/30. 10 stays a little better. But in the cool months 5 flows a little better.

[JSantoro]

Keyword "lube," limited to thread titles only and to the AR/M4 subforums: https://www.m4carbine.net/search.php?searchid=4926811

Keyword "lubrication," limited to thread titles only and to the AR/M4 subforums: https://www.m4carbine.net/search.php?searchid=4926808

Keyword "motor," limited to thread titles only and to the AR/M4 subforums: https://www.m4carbine.net/search.php?searchid=4926809

Orange, Google+M4C Search button, keywords "motor oil": https://www.m4carbine.net/gtsearch.p...=1860j568062j9

Took me more time to post the links to the 4 searches than it did to initiate and conduct those searches...