not.even.closer.not.even.close.
How's that for eloquence? No explanation needed, just periods placed randomly.
not.even.closer.not.even.close.
It would be similar to saying "Stick with SG rated 5W-30 oil, don't use the current SP 5W-30."
It would be "use 5W20 instead of 10W40 because bottle says is "better". Ignore the numbers posted in the data sheet completely.As stated a hundred times here … Dex VI holds viscosity at temperature better than the old stuff. I’m not researching his stuff … I’m responding to others making the point that Dexron VI is backwards compatible
Same with LV fluids. They start lower than the lowest a normal used ATF will drop.
You stated that an ATF’s frictional characteristics are defined by its viscosity. I’m not sure there’s an “eloquent” way to respond to such nonsense.How's that for eloquence?
You stated that an ATF’s frictional characteristics are defined by its viscosity.
Can you try an analogy that makes sense …It would be "use 5W20 instead of 10W40 because bottle says is "better". Ignore the numbers posted in the data sheet completely.
And yes, the 5W20 SG will "hold its viscosity" better... but since it starts lower that the other fluid (both measured at 100C), is still not appropriate.
Same with LV fluids. They start lower than the lowest a normal used ATF will drop.
Unfortunately you cannot buy a fluid with that specification anymore
It's even part of the DEXRON VI specification. And not only is it backwards compatible, it supersedes the previous license.
Could also very likely be a seal that has gone bad. Which is my guess.At 32k miles and 22 years old it is probably safe to say that it is not a dirt/wear problem and probably a fluid oxidation issue. I would do a coolant like exchange and see what happens.
Also quite possible.^Could also very likely be a seal that has gone bad. Which is my guess.
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I would throw some Supertech Dex/Merc (566053874) in it.Just get plain old DEXRON III type fluid and service it. My guess is some of the seals due to age are no longer able to assist in maintaining pressure and going thinner (LV) is not going to help your cause. Hopefully @clinebarger chimes in because I'm not a transmission expert but he is.
Add me to the list of people that disagree with you. I had maxlife in my 270k mile gm 4 speed auto from the 80s. It's been in there maybe 10-15k now, previously it was dexron 6 and mercon 5 before that. I also used dexron 6 in several other of the same transmission model (gm th2004r) with no issues on any of them. I would never downgrade to dexron 3 in any of my old transmissions.Wrong fluid for that transmission. Everyone (that knows a bit about transmissions) tells you not to use a "modern" LV fluid in a transmission built 1998, but that's exactly what you did.
Whatever...
You're just lucky I guess. I don't like to gamble and I don't tell other to gamble just because once I won a lottery ticket.I would never downgrade to dexron 3 in any of my old transmissions.
You're just lucky I guess. I don't like to gamble and I don't tell other to gamble just because once I won a lottery ticket.
FYI AMSOIL makes synthetic fluids with both viscosity, normal and LV. For people that care about original specifications.
I guess they don't know what they are doing either.
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For their "Signature" series they even raised a bit the LV 100C (hot engine) viscosity. Again... probably they don't know anything about ATF fluids?
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So, if it's more than that, it can be ignored?I think there is more to it than just the viscosity ranges.
If it meets the requirements by GM it's probably fine. Not many others agreeing with you here about that. It's like saying using 5w20 in a vehicle that specs it but originally called for 5w30 will most likely cause the engine to fail. It's debatable which will cause more long term wear but it's safe to say most vehicles running 5w20 won't fail because of it. You're like some old guy saying "don't use that new full synthetic oil in that old V8 engine - it wasn't meant for it".So, if it's more than that, it can be ignored?
Example of similar argument: "Live is more than just breathing air, so air can be ignored as a requirement for life."
AMSOIL doesn't ignore the viscosity. I guess you know better, just because your cars didn't crap out yet.
PS: Miles don't mean anything to me. Miles on highway don't heat up the transmission fluid, mine hovers at about 65C/150F. Sitting at a stoplight in 95F summer head will bake it at over 99C/210F.
Auxiliary coolers will keep transmission fluid cooler (and thicker) than the 100C value. It doesn't mean that everyone that doesn't have an aux cooler or doesn't drive mostly on highways, will have the same experience.
Not failing, but have problems on long term.It's like saying using 5w20 in a vehicle that specs it but originally called for 5w30 will most likely cause the engine to fail.
In case you weren't aware mercon v is synthetic blend. I used it working at the Ford dealer instead of dexron 3 and before switching to dexron 6 after doing much research on here. That was almost 20 years ago though.Not failing, but have problems on long term.
I had a 2001 Ford Explorer with the V8 5.0L engine. Engine designed in 1968, probably for 20W40, but sold for a while with a requirement of 5W30.
In my model the manufacturer said 5W20. When I bought it after 8 years, with that engine warm, at idle RPM, only 15W50 was able to keep the oil pressure needle quiet, anything else would indicate low pressure. That was not Ford problem, since it was past warranty and they fulfilled the CAFE mandate. It was mine.
That Explorer had a transmission with Mercon V and it lasted 200k miles with that "non-synthetic" fluid. Rust got to its brake lines and frame eventually.
Same with a Mercury Sable that used Mercon V (non-synth) until was totaled at 170k miles.
I like synthetic oils that have the specs that my transmission came with, not lower. If I can't find, I use good, modern, oils that respect that specification. It's not hard to do, plenty of good alternatives.
I think that Mercon V it's actually only Group 2+ (hydroprocessed).mercon v is synthetic blend