DASHOCKER

iTrader: (2)

I have a 98 gs400 . Are there any benefits using synthtic differential fluid over conventional? Any perfomance gains with the synthetic?

PERRYinLA

If you search, you'll find a post from someone who put Royal Purple synthetic in his diff and felt a dramatic difference (so he says).

Since it is synthetic, theoretically the friction is lower and so you should get a RWHP gain, but it probably won't be significant enough to feel.

But it certainly can't hurt and since differential fluid is changed so seldom, the extra cost of synthetic is negligible.

/Aerostar\

iTrader: (2)

Go for Redline 75w-90, I swear by this stuff

mburnickas

I do not get any MPG increases but it does stay cleaner MUCH longer. I use Amosil Series 2000 in my cars and my tractor. I have to in the my Kubota BX22 since I can go over 8 MPH!

saber

The major synthetic oil companies like Mobil have had 30 years to provide the public with REAL (vs IMAGINARY) data proving synthetics offer noticably better fuel economy and performance yet have failed to do so. Why? Possibly two reasons:

1. The fuel economy and performance gains are embarrassingly miniscule.

2. Slickly worded advertizing like "greater film strength" and "flows better when cold" is
all it takes to get the public to IMAGINE* synthetics will provice noticably better performance
and fuel economy and thus generate sales.

*This sales technique is called "Subliminal Messaging"

mburnickas

saber-- I would not go as far as saying is it BS on the flow & fuel economy . I know my Kubota BX22 had regular gear oil and it took a while to ingage the 4x4. With synthetic it was engages right then and there when I needed it.

Lastly, if you only had a 0.1 MPG gain over a 30,000 mile drain and fill, it would save about 400X times the original valve (of $8 per qt) or $129 savings over those miles @ 23.2 MPG.

If it added 0.05 it would save $64 etc etc. Just do the math since it pays for itself in a very short time.

If it isall "Subliminal Messaging" then you know more then billion dollar corporations (Ford, GM, MB, John Deere, Kubota, New Holland and all the other oil producers.) .

There is a differance and you get what you pay for.

saber

30,000 miles divided by 23.2 MPG = 1,287 gallons of gas consumed
30,000 miles divided by 23.3 MPG = 1,293 gallons of gas consumed

6 gallons of gas saved = $12.00 saved

But even this tiny savings is all hypothetical because none of the major synthetic oil companies have provided data demonstrating any gain in MPG when using synthetic oil in the rear differential.

mburnickas

Again they use it for more the MPG savings....Also the example I did was for me. Someone might be more and someone less.

Again I think the companies know a slight more then you, me etc. If you are going to "fight the man" with just MPG savings, you will lose. There is more involved then just that.

To close, the public could be non-educated but it is not as bad as you think. Each person is differant.

I have used syntheitc and use it longer then most (12K intervals for engine). So far no can post anything to prove it is bad. I have my oils tests, too bad no one else can post theirs. All I see it writing, saying this and that. Lets see some tests??? Anyone. Don't post picture of Toyota engine oil either or some dashboard of a car.

saber

REAL MPG savings or IMAGINED savings? Common sense dictates that if the MPG savings were REAL, the synthetic oil companies would have been boasting about this benefit for the last 30 years. But they havn't, which is a hint that the presumed MPG gain gains are not real or are embarrassingly miniscule.

mburnickas

Well if you want to play on the MPG role fine. But there are many other reasons TO use them.

Lastly, most synthetic fluids do show increases but most are tests on a dyno at a constant speed. My driving is not constant nor do I care out MPG. There use far excess MPG proaganda. If you want email some companies on the subject.

PERRYinLA

"Don't post picture of Toyota engine oil either or some dashboard of a car. "

It's not often I "LOL", but I did on that line!

Mike, you crack me up!

mburnickas

I LOL when I wrote it since some people love to push Toyota products....

We laugh, while others use this as proof!

VSsc400

iTrader: (1)

i don't feel any difference. I went from whatever was in from factory to Royal Purple. no difference in feel

mburnickas

I know in my last truck (F350 diesel) the rear end was much smooth on take off with 425 lb of torque. Plus I could go much longer with drains and that was a life staver when draining 9 qt in a rear end.

joshoowa

iTrader: (1)

so when exactly do you need to change out teh differential fluid? what every 30k miles?