Lubricant choices 1996 F150 4X4 4.9L 5 speed
 

Ok, so I basically want some input on what anybody has been using for lubes that has the same/similar parts on their vehicle.

I'm only using non-petroleum fluids, so no dino recommendations, please.

Engine - 4.9L I6 300ci - 5w30 recommended
Transmission - M5R2 (Mazda OD) - ATF recommended
8.8" rear differential - 75W90 w/ Ford brand Friction Modifier
Dana 44 front differential - 75W90 w/ Ford brand Friction Modifier

Of course, I'll be using the truck to tow occasionally.

My question is, since I'm interested in getting the best fuel economy I can with this truck, are there any suggestions other than the mfg's suggestions for fluid, or are these about as good as it gets?

I know for engine oil I can use 0w30, and I'll probably even go as low as 0/5W20, if I can find it. Brand isn't really important as much as it being non-petroleum.

Transmission - Is ATF really the best way to go here? If it is, I can get synthetic ATF pretty cheaply at Wally World.

75W90. There was a TSB at some point detailing the use of SYN 75W140 w/ 4oz friciton modifier, but I don't really see myself going to a heavier weight oil, especially when I've seen trucks run for their entire life without a diff oil change. I suppose I'm asking if I can go lighter than this, even though I'm going to haul/tow with it? Also - is the friction modifier necessary?

Greases... is it going to make much of a difference if I wash the bearings and re-pack them with synthetic grease? I'm sure it's never been done... What syn grease should I be using to keep rolling resistance to a minimum?

I'm not sure what I'm supposed to use the t-case, either... but I assume it's an extra 2qt of ATF.

Anyone?

Post the questions over on Welcome Plenty of reading over there on this subject set.

My first thought would be Mobil DELVAC 5W-40 for the engine. And a low-restriction, high-capacity oil filter (DONALDSON Synteq media; same as AMSOIL EaO). Same brands for air filter.

Also look at Auto-Rx regimen for that truck, first, using dino in 5W or 10W-30 with cheap filters. A series of UOA's would be best to document and see wear-trending.

Since you intend to do some towing I'd also look to being perfectionistic about the cooling system as in all new parts. I've never been sorry to do it that way as repairing component-by-component is a PITA. De-ionized water with FLEETGUARD Compleat is my choice, and a ROBERTSHAW Balanced Sleeve thermostat (Mr. Gasket), not to mention new fan clutch and any possible improvements to the fan shroud. Age, alone, dictates this level of work, IMO. Removing block drains is the first step. I usually run either RMI-25 or Schaeffer's #258 afterwards.

Also a good time to replace timing chain if so equipped.

As to greases, contact via PM "Sales Rep" [?] the SCHAEFFER Oil rep who posts there.

Look into Amsoil lubricants for this truck