ST205 fluids

[Boosted_162]

I ran shockproof in my ST185 RC. Its made by Redline and you can get it from BNT. Comes in 900ml bottles and is pretty expensive at retail ($30-odd a bottle). If you can get it at trade its a fair wack cheaper.

[RunningRich]

GL-5 is stated by Toyota for the GT-Four. Always has been since 1986, even once most other manual cars had swapped to ATF.

No point comparing the GT-Four to the MR2, MR2's don't have a transfer hanging off them and have significantly lower loads on the final drive.

I've disassembled a ST185RC gearbox that had wear on the final drive, most likely from using the wrong oil. Lucky I was changing the final drive ratio anyway as I wouldn't have put the parts back in.

I realise ATF isn't GL-anything rated but I know of many people that have used it long term in high-power GT-Fours with no wear issues.

Over 13+ years of GT-Four ownership I've tried a few oils! I can think of five off the top of my head, the only good ones were Redline 75W90NS and ATF. I once used some expensive castrol (?) and it was rubbish.

[sergei]

Anyone knows what brand/grade Toyota is using from factory?

I don't have any issue with Castrol Multitrax, I would not put Syntrax in the gearbox as it is way too expensive and too thin.
I drive my car hard, not like whole bunch of wankers who buy EVO/WRX/other performance cars, and drive 80ks on motorways and to do their shopping.

My concern with ATF is that does not have any additives to work with shear load.
GT4 has got hypoid gear in transfer case (just like a RWD diff). Hypoid gears are sliding gears (http://en.wikipedia.org/wiki/Hypoid), they slide against each other (all gear actually do that, but hypoid does a lot more) similar to screw/worm gear, this load requires special additive to stop oil from breaking the film and allowing metal to metal contact. In hypoid gears the pressure in the contact area is a lot higher than in straight gears. ATF normally does not have the additives for this (http://en.wikipedia.org/wiki/EP_additives).
In normal situation ATF will be seprate from hypoid gear oil.

Also when choosing oil for 4WD gearbox that has transfer case in the gearbox, you have to be careful to choose the one that is designed for synchros, as a lot of hypoid oils have chemically active additives that will react with bronze parts.

[ihavelift]

This is what I'm going for:

10w40 Valvoline Durablend

for gearbox/dif etc HP Gear Oil LS90

[sergei]

This is what I'm going for:

10w40 Valvoline Durablend

for gearbox/dif etc HP Gear Oil LS90

HP Gear Oil LS90 will be wrong oil for gearbox and diff.
it is designed for differential with mechanical LSD.

If you want valvoline, according to this you need either 75W90 or 80W90, as they are both GL5 specs and are for gearboxes as well (the LS90 is the diff only oil).

http://www.valvoline.co.nz/prod0111.htm

[ihavelift]

OK SO

this is what i just went and bought:

5L Valvoline VR-1 Racing 10w/40
6L Valvoline HP Gear Oil 75w/90 (for gearbox)
2L Valvoline HP LS90 (for diff)

Havn't got brake fluid yet, but going to get some Dot5 stuffs

[sergei]

OK SO

this is what i just went and bought:

5L Valvoline VR-1 Racing 10w/40
6L Valvoline HP Gear Oil 75w/90 (for gearbox)
2L Valvoline HP LS90 (for diff)

Havn't got brake fluid yet, but going to get some Dot5 stuffs

Better get Synthetic diff oil they have lower in the list for the rear diff:
Valvoline Heavy Duty Synthetic Gear Lubricant SAE 75W/90

Your diff does not need LSD Oil (LS90) unless it has mechanical (clutch pack) aftermarket unit. ST205 has Torsen at the back which is just whole bunch of helical gears (instead of clutch pack), hence you are better off using high quality hypoid oil without LSD additives.

[xsspeed]

pretty sure if you want a high dot rating don't get 5 but get 5.1

something about dot 5 absorbing more moisture if keft for a while = boiling in brakes = no brakes

I am sure someone will be able to confirm this.

[sergei]

pretty sure if you want a high dot rating don't get 5 but get 5.1

something about dot 5 absorbing more moisture if keft for a while = boiling in brakes = no brakes

I am sure someone will be able to confirm this.

Not quiet, DOT5 is silicone based and completely incompatible with other DOT fluids. DOT5.1 is alcohol based and is compatible with DOT3/4. Your brake system needs to be dry off old fluid completely if DOT5 used. While DOT5.1 should be fine. Also DOT5 is not compatible with ABS.
http://en.wikipedia.org/wiki/DOT_5 vs http://en.wikipedia.org/wiki/DOT_5.1

DOT5 is hydrophobic and does not damage the paint
DOT5.1 on other hand is hygroscopic and damages the paint (just like DOT4).

[xsspeed]

oh, hmm not the reason I was recommended 5.1 but sounds good enough. Old system would have been dot 3 as well so makes sense.

I thought dot 5 was more hydroscopic (if thats the correct term - absorbs water) and so only really recommended for systems that are bled regularly.

Edit: upon reading your links seems I was fed the wrong info but still recommended the right product - bit of a 'phew' moment there.

[sergei]

Anyway, for what it is worth make sure you get either DOT4 or DOT5.1. Stay away from DOT5 (notice lack of .1).

[ihavelift]

OK SO

this is what i just went and bought:

5L Valvoline VR-1 Racing 10w/40
6L Valvoline HP Gear Oil 75w/90 (for gearbox)
2L Valvoline HP LS90 (for diff)

Havn't got brake fluid yet, but going to get some Dot5 stuffs

Better get Synthetic diff oil they have lower in the list for the rear diff:
Valvoline Heavy Duty Synthetic Gear Lubricant SAE 75W/90

Your diff does not need LSD Oil (LS90) unless it has mechanical (clutch pack) aftermarket unit. ST205 has Torsen at the back which is just whole bunch of helical gears (instead of clutch pack), hence you are better off using high quality hypoid oil without LSD additives.

will it really make that much of a difference? i have the oil now (on your advice by the way).

[sergei]

OK SO

this is what i just went and bought:

5L Valvoline VR-1 Racing 10w/40
6L Valvoline HP Gear Oil 75w/90 (for gearbox)
2L Valvoline HP LS90 (for diff)

Havn't got brake fluid yet, but going to get some Dot5 stuffs

Better get Synthetic diff oil they have lower in the list for the rear diff:
Valvoline Heavy Duty Synthetic Gear Lubricant SAE 75W/90

Your diff does not need LSD Oil (LS90) unless it has mechanical (clutch pack) aftermarket unit. ST205 has Torsen at the back which is just whole bunch of helical gears (instead of clutch pack), hence you are better off using high quality hypoid oil without LSD additives.

will it really make that much of a difference? i have the oil now (on your advice by the way).

Should not make much difference.
BTW I never told you to get LS90

HP Gear Oil LS90 will be wrong oil for gearbox and diff.
it is designed for differential with mechanical LSD.

[ihavelift]

oh well, my bad. i can just get some other oil. what do you recommend? (so sick of getting a bazillion different answers to this) ... my cars done just over 200k so really want something that will keep it in tip top shape.

Also got some engine flush, called nulon or something, yay or nay?

[sergei]

You cannot say one oil is better than another without doing multi-million dollar research. As long as you use known brand (and not some chinese imposters) and right grade you are fine.
Just get synthetic GL5 (75W90) oil for the diff (2L) and semi-synthetic/mineral GL5 (75W90) oil for the gearbox (6L). Replace gearbox oil and diff oil once a year and you will be fine.
For engine get something along the ways of 10W40 / 15W40 (10W50 and 60 is also good). Replace it with Toyota filter once every 5000km or 6months (whichever first).
For brake fluid get DOT5.1 and bleed the brakes once a year with it.
For coolant get Toyota long life coolant (red) of TS toyota sponsor, it supposed to last up to 5 years.

[ihavelift]

Yup have 10w40 for engine and GL5 for gearbox, I should just be able to use the ls90 for the diff though shouldn't i?

and yup I'll look into getting some Dot5.1, but definately not Dot5 is that right? Spoke to a guy who worked in a Toyota workshop, he said definately Dot 5. Jeebus i'd give anything for just a straightforward answer haha

[sergei]

Yup have 10w40 for engine and GL5 for gearbox, I should just be able to use the ls90 for the diff though shouldn't i?

and yup I'll look into getting some Dot5.1, but definately not Dot5 is that right? Spoke to a guy who worked in a Toyota workshop, he said definately Dot 5. Jeebus i'd give anything for just a straightforward answer haha

DOT 5.1 . It should say on the bottle that is glycol/alcohol based, compatible with DOT3/4 and that it will damage the paint .

You can use LS90 in rear diff no problem (just don't use it in the gearbox).

[ihavelift]

damage the paint?!?! $&#$% i'm such a noob ... so excust question ... but that won't matter, as long as you're not a spaz and spill it on the car ... right?

EDIT: and what about the Nulon engine oil flush?

[sergei]

damage the paint?!?! $&#$% i'm such a noob ... so excust question ... but that won't matter, as long as you're not a spaz and spill it on the car ... right?

EDIT: and what about the Nulon engine oil flush?

Well the right one will damage the paint, if it says that it will not damage the paint it will mean that you got wrong fluid.

Don't use engine flush. It is just plain kerosene. It ruins seals, and sometimes can dislodge sludge that will block oil pick-up line.

[Akane]

While on the topic, is there any way to make my LSD lock harder? Ever since I swapped to a Gen 3 gearbox the LSD is lazy at best, can I add addictives to make it lock?