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#3167981 - 10/26/13 01:19 AM Re: Oil recommendation for a 1991 Lexus LS400? [Re: Finn]
raytseng Offline


Registered: 12/11/08
Posts: 1556
Loc: CA
I would also pick up a new pcv valve (should not be expensive), and whatever your favorite 5w-30 syn is on sale. Actually if 5w-30 isn't available, whatever is your common oil in your location will be fine.

(Owned '90 LS400 from 1997-2009)

The main common problems of this car will be:
-the power steering system will develop an issue where a particular air valve does not close properly, and fluid will be sucked into the vacuum system and burned in the intake. You can plug and cap off that part of the PowerSteering solution to fix it; or just deal with it by just topping off the fluid. (Uses Dex II or higher compatible ATF).
This may cause contamination of a lot of systems if this happens for a long time.

-the AC/Radio LCD display panels will likely go out.

-the suspension is likely not very good anymore and will need replacement.

You can search on lexus forums for these specific issues if you need.


Edited by raytseng (10/26/13 01:32 AM)

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#3168368 - 10/26/13 12:06 PM Re: Oil recommendation for a 1991 Lexus LS400? [Re: raytseng]
Finn Offline


Registered: 03/01/10
Posts: 380
Loc: Finland
Went to see the car today. Was pleasantly surprised of it's good condition and as we agreed on the price I'm now a happy camper. grin



According to service manual she has been fed with 5/10W-40 oils since new - European Lexus manual shows 40 as well as 50 grades in addition to 5/10W-30 oils. My Corolla gets Shell Helix Ultra 5W-40 so that's what we put in now. I may consider M1 0W-40 in the future but we'll see.

Just three things to do:
- OD light blinks in the gauges -> could be a corroded connection or sticky/bad solenoid
- engine runs at 66 degrees Celsius -> thermostat probably stuck open a bit
- small LCD display up in the center console is very dark -> need to get new one

The ride is phenomenal!
_________________________
1991 Lexus LS400 | 2000 Audi TT quattro 225 hp | 1978 Corvette 427" | 1986 Corvette 383" | 2003 FLHR | 1984 GSX750EF

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#3168409 - 10/26/13 12:55 PM Re: Oil recommendation for a 1991 Lexus LS400? [Re: Finn]
Falcon_LS Offline


Registered: 10/03/08
Posts: 3807
Loc: Kuwait
Shell Helix Ultra 5W-40 is great oil. Out of curiosity, can you get Shell Helix Ultra AS 0W-30?

After you replace the thermostat, you might want to check the condition of the coolant. If needed, flush out thoroughly and go with Toyota Super Long Life coolant (pink stuff).
_________________________
99 Explorer EB: GC 0W40/FL1A
00 Pajero: Aisin PAO/Ester 5W40/MD352626
01 Marquis: GC 0W40/FL820S
03 Expedition: M1 0W40/FL820S
05 Envoy: GC 0W40/M1206

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#3168428 - 10/26/13 01:21 PM Re: Oil recommendation for a 1991 Lexus LS400? [Re: Falcon_LS]
Finn Offline


Registered: 03/01/10
Posts: 380
Loc: Finland
Not at least locally - not sure if they import it.

Roger on the coolant. Winter is coming and need to get that thing in order as well.
_________________________
1991 Lexus LS400 | 2000 Audi TT quattro 225 hp | 1978 Corvette 427" | 1986 Corvette 383" | 2003 FLHR | 1984 GSX750EF

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#3168465 - 10/26/13 02:26 PM Re: Oil recommendation for a 1991 Lexus LS400? [Re: Finn]
CATERHAM Offline


Registered: 11/18/05
Posts: 10074
Loc: Burlington, Ontario, Canada
Any light A5/B5 0W/5W-30 (not A3/B4) would be the oil grade to use and that would apply to your Corolla as well.

A 0W/5W-40 would be considerably heavier than necessary particularly for winter use.
_________________________
74 Lotus Europa, 5W-50
86 Porsche 928S, TGMO 0W-20 25% / M1 0W-40 75%
96 BMW 328i, Idemitsu/TGMO 0W-20 70% / M1 0W-40 30%
94 Caterham 7, FUCHS 0W-20

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#3168501 - 10/26/13 03:34 PM Re: Oil recommendation for a 1991 Lexus LS400? [Re: Finn]
Finn Offline


Registered: 03/01/10
Posts: 380
Loc: Finland
Thanks, mate. I will consider changing to a lighter oil after some cleaning with Ultra first.
_________________________
1991 Lexus LS400 | 2000 Audi TT quattro 225 hp | 1978 Corvette 427" | 1986 Corvette 383" | 2003 FLHR | 1984 GSX750EF

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#3168547 - 10/26/13 04:50 PM Re: Oil recommendation for a 1991 Lexus LS400? [Re: Finn]
zeuloa Offline


Registered: 09/29/13
Posts: 101
Loc: Nicaragua
Helix Ultra seems like a great oil. How does your corolla like it?

What TGMO do the Toyota/Lexus dealers sell there?

Great car!

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#3168561 - 10/26/13 04:58 PM Re: Oil recommendation for a 1991 Lexus LS400? [Re: Finn]
Finn Offline


Registered: 03/01/10
Posts: 380
Loc: Finland
Corolla does well with it - oil usage is low and everything works OK. I like the Helix Ultra more and more.

As far as I can tell there are 5W-30, 5W-40 and 10W-40 Toyota oils available at the dealer. They are not very affordable, though, meaning that you can get M1 0W-40 at market for the same price as TGMO 5W-30 at the dealer.
_________________________
1991 Lexus LS400 | 2000 Audi TT quattro 225 hp | 1978 Corvette 427" | 1986 Corvette 383" | 2003 FLHR | 1984 GSX750EF

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#3168981 - 10/27/13 03:59 AM Re: Oil recommendation for a 1991 Lexus LS400? [Re: Finn]
Garak Offline


Registered: 12/05/09
Posts: 18706
Loc: Regina, Saskatchewan, Canada
Originally Posted By: Finn
- engine runs at 66 degrees Celsius -> thermostat probably stuck open a bit

Very nice car and very nice shape. You may want to fix that thermostat before the cold kicks in too bad. A number of years ago, that happened to my Town Car, conveniently when it went down to around -40 C. I was not terribly happy with the heater's performance, to say the least.
_________________________
Plain, simple Garak.

2008 Infiniti G37 coupe - Mobil Delvac 1 ESP 5w-40, Wix 51358
1984 F-150 4.9L six - Quaker State GB 10w-30, Wix 51515

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#3169310 - 10/27/13 01:33 PM Re: Oil recommendation for a 1991 Lexus LS400? [Re: Finn]
CATERHAM Offline


Registered: 11/18/05
Posts: 10074
Loc: Burlington, Ontario, Canada
Originally Posted By: Finn
. They are not very affordable, though, meaning that you can get M1 0W-40 at market for the same price as TGMO 5W-30 at the dealer.

Assuming TGMO 5W-30 is a light A5/B5 oil and it's the same price as M1 0W-40 then that's certainly the preferred oil to use for both the LS 400 and the Corolla.
You also mentioned the GM 5W-30 was "very very affordable" so if it's cheaper than TGMO 5W-30 go with that.
_________________________
74 Lotus Europa, 5W-50
86 Porsche 928S, TGMO 0W-20 25% / M1 0W-40 75%
96 BMW 328i, Idemitsu/TGMO 0W-20 70% / M1 0W-40 30%
94 Caterham 7, FUCHS 0W-20

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#3170230 - 10/28/13 12:59 PM Re: Oil recommendation for a 1991 Lexus LS400? [Re: Finn]
CELICA_XX Offline


Registered: 11/28/08
Posts: 661
Loc: Oklahoma
Originally Posted By: Finn
Just three things to do:
- OD light blinks in the gauges -> could be a corroded connection or sticky/bad solenoid

This link might save you HOURS of time and a lot of money. You can Google "LS400 trunk harness" for more information.

This is a somewhat common issue with the 1st gen LS400.

http://www.lexls.com/tutorials/lighting/bulbout.html
_________________________
15 Toyota Prius - M1 EP 0w20
02 Toyota ECHO - PU 5w30 / KREEN experiment
97 Lexus LX450 - M1 0w40
93 Lexus LS400 - Valvoline MaxLife Full Syn 5w30

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#3170264 - 10/28/13 01:39 PM Re: Oil recommendation for a 1991 Lexus LS400? [Re: Finn]
Finn Offline


Registered: 03/01/10
Posts: 380
Loc: Finland
Thanks for the link.

Originally Posted By: Finn
Just three things to do:
- OD light blinks in the gauges -> could be a corroded connection or sticky/bad solenoid
- engine runs at 66 degrees Celsius -> thermostat probably stuck open a bit
- small LCD display up in the center console is very dark -> need to get new one

The ride is phenomenal!

Let's see to do-list:
- OD light blinks in the gauges -> could be a corroded connection or sticky/bad solenoid

This was cured by just driving the thing.

- engine runs at 66 degrees Celsius -> thermostat probably stuck open a bit

We changed the thermostat and engine now reaches normal temperature. It feels completely different in a good way and it was already good when running cold.
_________________________
1991 Lexus LS400 | 2000 Audi TT quattro 225 hp | 1978 Corvette 427" | 1986 Corvette 383" | 2003 FLHR | 1984 GSX750EF

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#3170904 - 10/29/13 12:15 AM Re: Oil recommendation for a 1991 Lexus LS400? [Re: Finn]
raytseng Offline


Registered: 12/11/08
Posts: 1556
Loc: CA
congrats!
be sure you keep a close eye on the power steering fluid level and take action when it begins to consume fluid.


Edited by raytseng (10/29/13 12:15 AM)

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#3171706 - 10/29/13 05:25 PM Re: Oil recommendation for a 1991 Lexus LS400? [Re: raytseng]
Finn Offline


Registered: 03/01/10
Posts: 380
Loc: Finland
Yep, checking the PS fluid every now and then.

About the oil - what is the BITOG verdict of Total Quartz Energy 9000 0W-30 oil?

I have found a way to get it rather cheaply but have zero experience of French oils. Is this good stuff?

_________________________
1991 Lexus LS400 | 2000 Audi TT quattro 225 hp | 1978 Corvette 427" | 1986 Corvette 383" | 2003 FLHR | 1984 GSX750EF

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#3171763 - 10/29/13 06:50 PM Re: Oil recommendation for a 1991 Lexus LS400? [Re: Finn]
CATERHAM Offline


Registered: 11/18/05
Posts: 10074
Loc: Burlington, Ontario, Canada
The above oil is an A3/B4 oil with a 170 VI.
So it's a heavy 30wt oil similar but perhaps a bit lighter than Castrol 0W-30.
It won't be any lighter than M1 0W-40 on start-up but if it's cheaper then it would be preferable.

It would still be better to go with an A5/B5 5W-30.
_________________________
74 Lotus Europa, 5W-50
86 Porsche 928S, TGMO 0W-20 25% / M1 0W-40 75%
96 BMW 328i, Idemitsu/TGMO 0W-20 70% / M1 0W-40 30%
94 Caterham 7, FUCHS 0W-20

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