Yeah, Amsoil ASL synthetic motor oil. Will let you guys know what they say. Once I get 15k on my LE607, I'll send that in also.

 

rworne, did you ever send in anymore samples to Blackstone?

 

Iron numbers shocked me when I first saw it, but looking at the change intervals you could still have break-in wear floating around and Redline is aggressive at cleaning. It didn't shear in viscosity at all. The Mobil1 may end up with significantly lower wear numbers if the old wear had remnants of break-in metals.

The damn postal service lost my differential fluid sample of Amsoil 75w110 which still burns my butt. I wont have a second sample until end of summer season. I'll likely have an interval of 5k max.

Thanks for posting.

 

Too bad you couldn't be sure how much break-in debris was in this oil ... because that iron number is seriously not good for such a short mileage sample. I would have expected 50-75 ppm if you had a clean start.

I drained the factory diff fluid at around 15,500 miles ... and it was ghastly. Nasty color and full of metal bits ... drain plug magnet was loaded with iron bits.

I filled with Chevron Delo 80W-90 ... and will drain that after just 3,000 miles or so (this summer) to give the next batch (same oil) a clean start. I will test that at 15,000 miles as well ... but that will be years from now.

 

will you get a UOA done on that at the end of this summer ?, it would be nice to see, sounds like we may have some decent diff fluid samples this year from a few members here. I'd like to see more diff samples .

 

I was not planning on it. It would not be a test of the Chevron fluid. I mean, c'mon. What gear oil will show any kind of wear/shearing in 3,000 miles? The test would just show what was left behind by the factory fill.

I do want to test the 2nd fill, however. Problem is, it will take a LONG time to get there (~3 years).

 

do you have a pic of the drain plug magnet/contamination?

Was this drained hot?

 

Hmm, I just change my fluid out every other oil change. I use a combination of one part redline shock proof and 3 parts mobil.

Its what, maybe $10 and an extra 10 minutes when I'm doing an oil change. it seems like cheap insurance to me.

 

I'll be sampling mine once a year which is 3000-4000 miles max, I'm just too anxious to wait 2-3 years to know if things are decent or not. Though not necssarry and perhaps a bit of a waste I'll be draining the diff yearly. I'm not sure if Amsoil 75w140 is worthwhile or if it will make things worse, so I want to analyze it on a short invterval and then decide if I should go back to 75w110.

 

james0933, that's not a bad combo. The Red Line Oil Shockproof (which weight?) uses a solid-form of molybdenum (disulphide?) and should be the best at guarding wear under high, high load conditions.

JFusion, I'm a BITOGer so I'm not against testing and short drains ... but 3,000 miles on gear oil? I would say anything would perform well in that amount of time. It takes many thousands of miles and (really) multiple samples to spot wear clear trends using UOAs. With the way most of us do it, it leaves so much open to guessing. I've been OK with that in the past ... but even engine oil at 3,000 looks good 90%+ of the time.

I guess what I'm saying is that if you are going to swap diff fluids every 3,000 miles, I'd go with whatever you can get for $3-5 per quart.