just read a huge test done between like 10 or 15 different gear oils and the amsoil was their overall winner. Just wondering who all uses it and if they noticed a difference?

 

Never used it.

 

Used it, no noticeable difference. No better fuel mileage, no cooler rearend after towing (verified temp with heat gun) Next time I'll put my money somewhere else.

 

hmmm yeah it is expensive but according to the comparison it beats everything else at preventing wear and tear. I can post it up if anyone would like to see it.

 

Seen it, how many rear ends are you going to go through on your Ranger? My F-350 has 255K and has the factory rear end, ring and pinion, spider gears, bearings they all look good, not saying they weren't replaced, but judging from what I've seen working on a variety of stuff I beleive they haven't been.

I'm still saying it's not worth it.

 

I mean its the same one. I only got 60,000 miles so the damn thing better not break for a long time. But im just a fan of doing things right the first time and thats all. I could just go with regular motorcraft stuff and motorcraft friction modifier but just thought it would be cool to go royal purple or amsoil. Even though they are more expensive, if it was doing a better job than I might consider it worth my money you know.

 

If it improved fuel econ or the temps, I would be on the bandwagon with it. I just used the normal 75w140 and change it every 75K miles. Ford recommends 150K

 

Never used it but plan on doing my trans fluid with it.

 

I use it... good stuff... but are you actually going to see a difference in 'light duty' applications... probably not.

 

yes I figured so, so do you guess recommend using the amsoil or royal purple or just to stay with motorcraft?

 

How can the fluid temp staying the same mean it's not better? That's only one measurement of quality.

I run it in my truck. Does it make a difference? I am unsure. I do know that my truck pulls more than most do on this site, and at 150k, with 40k on the oil, everything is running great. I think I might have a U joint or CV axle going, though. It's only 2 quarts or so, so the price shouldn't sway you that much.

 

How can the fluid temp staying the same mean it's not better? That's only one measurement of quality.

I run it in my truck. Does it make a difference? I am unsure. I do know that my truck pulls more than most do on this site, and at 150k, with 40k on the oil, everything is running great. I think I might have a U joint or CV axle going, though. It's only 2 quarts or so, so the price shouldn't sway you that much.

 

I didn't say that lowered it's quality...I don't doubt it's quality at all. I used to tow all the time (up to about 3500 lbs). It had the original oil at 40K. I just checked the temps after towing 20 miles because I was curious. I then switch to Amsoil, same haul, same temps, Same fuel economy, it's not like the super lube that freed up my truck and was allowing it to get better mileage. I pulled the cover to add a chrome one and just put normal lube in.

I'm just observing that it's not really necessary to spend extra money on the syn gear lube if it's not needed. And since the poster asked if anyone noticed a difference, I told him what I felt.

 

thanks for the honesty, and yeah I know its going to be hard to really tell a difference in somethiing like that, especially just a regular real world difference after only a small amount of time. But i figure even thought it is more money, rear fluid is one of those things that hopefully you wont need to change very often so the extra money will prolly be worth it and you dont have to bite the bullet to much. I wish I could do my front diff to, but you cant unless you drop the front diff. So im thinking about just doing the rear diff, manual tranny, and transfer case in it, and keeping the front diff, regular oil, and filter just regular cheaper motorcraft.

 

You can get a fluid vaccum and suck it out of there. Most shops will have one. Thats' how I changed mine.

 

does it really get all the fluid out that way tho? I just didnt know if having some old left over in there will matter when your changing brands and the weight willbe different being full syn?

 

If you get most of it out, it will be fine. You'd have to wipe down the gears and clean out the axle tubes to get it all.

 

im still debating if I should try it or spend half as much and stay motorcraft hmmm?