What synthetic atf fluid/oil is better than WS. - Toyota RAV4 Forums
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post #1 of 34 (permalink) Old 10-26-2014, 01:18 AM Thread Starter
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What synthetic atf fluid/oil is better than WS.

Hi just wanted to know if to upgrade my fluid from the Toyota WS as it is not synthetic, or is it best to use Toyota WS.I like Castrol synthetic fluid.
Please let me know your opinion and any advice would be greatly appreciated.
P.S
Info:
Van has 48000 miles.
First ATF fluid change, I am doing a full machine flush.
I use Castrol Edge synthetic in engine.

Thanks
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post #2 of 34 (permalink) Old 10-26-2014, 10:00 AM
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Toyota does not recommend a machine flush for WS fluid equipped transmissions in spite of what the dealer/garage says. The chance for overfill or underfill is great and they are VERY sensitive to the amount of fluid in the trans. The person using the machine must be an absolute expert in its use and follow Toyota procedures exactly. Few have such a person on staff.

I got this information from a top ASE certified Toyota/Lexus mechanic in Austin, TX. He is one that is qualified but has seen too many failures from this procedure and refuses to do it. His recommendation is to drain & fill three times over a short interval and use nothing but WS fluid NOT an equivalent. Were it my vehicle I would not chance it.

Having said that there are several folks here who have used other than WS fluid without problems......so far. If damage is done it will be over the long term.

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post #3 of 34 (permalink) Old 10-26-2014, 11:54 PM Thread Starter
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Which Transmission Fluid Do You Prefer.

I'm gonna be flushing the transmission and just wanted to get some testimonials from people. There are alot of debates on which fluid to use. I know some poeple say Toyota WS but I am leaning toward a Full Synthetic ATF.
Valvoline Max Life ATF
Valvoline Dex/Merc
CASTROL TRANSMAX Z
Castrol Transmax Dex/Merc
Castrol Transmax Import Multi-Vehicle
Mobil 1 Synthetic ATF
Redline ATF
Royal Purple ATF
Amsoil Signature Series Fuel-Efficient Synthetic Automatic Transmission Fluid

Or any others.
I'd like to hear your thoughts so send them my way thanks.

Last edited by RTexasF; 10-27-2014 at 01:20 PM. Reason: Threads merged. Don't need two threads on the same topic by the same author.
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post #4 of 34 (permalink) Old 10-27-2014, 12:03 AM Thread Starter
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Thanks for your advise. I actually did some research and there alot of debates on this, because Toyota does not recommended changing fluid at all.They say WS is a lifetime fluid.
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post #5 of 34 (permalink) Old 10-27-2014, 10:53 AM
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Quote:
Originally Posted by slipperclutch View Post
Toyota WS as it is not synthetic
Who told you so?

Also, define better.
Toyota did extensive studies and showed that the low viscosity, fuel efficient WS fluid didn't compromise wear protection in their trannies. Published in the SAE literature.
If you use alternative fluids, you just throw that science away and hope for the best.

I agree flush is not the way to go. Flushes don't clean filters inside.

One more thing, currently, cars are designed with useful life of 150,000 miles. WS is lifetime in that sense. I agree 50,000-60,000 miles is a sweat spot for a change (if no severe service) if one wants to keep the car for a long time.
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post #6 of 34 (permalink) Old 10-27-2014, 10:55 AM
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Quote:
Originally Posted by slipperclutch View Post
I'm gonna be flushing the transmission and just wanted to get some testimonials from people. There are alot of debates on which fluid to use. I know some poeple say Toyota WS but I am leaning toward a Full Synthetic ATF.
Valvoline Max Life ATF
Valvoline Dex/Merc
CASTROL TRANSMAX Z
Castrol Transmax Dex/Merc
Castrol Transmax Import Multi-Vehicle
Mobil 1 Synthetic ATF
Redline ATF
Royal Purple ATF
Amsoil Signature Series Fuel-Efficient Synthetic Automatic Transmission Fluid

Or any others.
I'd like to hear your thoughts so send them my way thanks.
You need to do more reaserch. Not all of those fluids are considered WS replacement.
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post #7 of 34 (permalink) Old 10-28-2014, 10:52 PM Thread Starter
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Thanks friendly_jacek will do some more research.
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post #8 of 34 (permalink) Old 10-30-2014, 02:54 AM
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Using Valvoline Maxlife ATF with LGR. First two drain and fills were with just the ATF the next two had LGR added. No issues and no crud on the drain magnet. Planning on running Amsoil SS ATF when I do a pan drop to change out the filter. I'll definitely be looking forward to seeing what the magnets and inner pan walls look like.

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post #9 of 34 (permalink) Old 11-02-2014, 06:05 AM
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Where did you find that Toyota WS is synthetic. All searches are saying its conventional. Can you post a link please?

2012 Black Rav4 Sport 4WD w/Tow Prep
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post #10 of 34 (permalink) Old 11-02-2014, 09:24 AM
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Have you seen this paper?
Comparison of OEM Automatic Transmission Fluids in Industry Standard Tests

Quote:
Based on the results, one can conclude that each ATF is uniquely formulated to specific OEM requirements. In addition, the results show that a customer should not deviate from the automatic transmission fluid specified in the vehicle's owners manual.
But coming back to your question, read the original Toyota WS development paper.

http://www.docin.com/p-178258044.html
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