B-61 MACK HELP

steve21757 · Regular Joined: 29 Feb 2008 Posts: 36 Report to Moderator

I am going to change the oil in my B-61 in the next couple of days.I live in Texas and was wondering would it be best to use Straight 30wt.or 40wt.THANKS ALWAYS FOR THE HELP. STEVE.

ericlb · Posted: Tue Oct 13, 2009 7:59 pm Post subject: Re: B-61 MACK HELP

i have run rotella 15w-40 in my big diesels for many years, never a oil related problem, straight weight oil will make that old mack a real chore to start in cold weather ,

russ springer · Posted: Wed Oct 14, 2009 3:37 am Post subject: Re: B-61 MACK HELP

30 wt was the recomended oil in a 673 engine

michael a. lee · Guest Report to Moderator

one of the reasons that engines last longer these days is multiviscosity oil. in the old days everyone thought your oil or grease should be as thick as a rope. trouble was that the bearings never got lubed untill the oil warmed up. this goes for engine oil and tranny and rearend grease as well.