944 transmission oil
10-22-2003, 01:47 PM
#1
Drifting
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944 transmission oil
What kind of oil should i use to replace the current oil in the transmission/differetial? I heard about Red Line but is Valvoline or Mobil 1 good? And what thickness? (15w40, 10w50 etc). The car runns great, i drove it yesterday and i cant think of anything else it needs. I just changed the oil, airfilter and pluggs.
10-22-2003, 02:36 PM
#2
Drifting
Do you have an LSD transmission?
75w90 Redline is what I think I'm going to put in mine. I know you need 75w90, but I don't remember if you get the NS for LSD or non-LSD.
75w90 Redline is what I think I'm going to put in mine. I know you need 75w90, but I don't remember if you get the NS for LSD or non-LSD.
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10-22-2003, 06:21 PM
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Copied from tech-session.com:
Good Luck!
The Basics:
Friction Modifier (FM) is slippery stuff. The FM is in place to reduce LSD clutch chatter upon engagement. The amount needed is relative to the application and the age of the differential. In full race cars, you want the clutch to lock up nice and strong while not being so concerned with a little chatter. In high mileage (or worn) LSD cars, the clutches will be worn and need less FM to attain the desired effect. The downside, or catch-22, is that the syncros don't need or even like the FM. In most cars this is not a problem because the differential and transmission are separated and do not share the same lubricant. Our transaxled P-cars do share, so we must prepare for that.
FM options:
FM needs to be used in LSD cars, we know that. It's the amount that is variable. As a general rule, what comes out of the bottle is sufficient for most applications. Some folks will mix FM stuff with non-FM stuff (75W90NS and 75W90) until the desired effect of "no chatter" is attained... the reason for this being again, that syncros don't like FM.
Oil weight:
In high-performance applications where the temperatures may get higher than street use, it is common practice to use a bit higher weight oil (75W90 vs. 70W80), and higher still if the tranny/diff is not externally cooled (80W140).
What about GL-5 vs. GL-4:
The main complaint against GL-5 use in syncro'd trannies is because the chemicals used to provide the extreme pressure protection can be corrosive to synchronizers, which are commonly made of brass or bronze. Here's what the 944 factory manual has this to say: "Filling capacity Approx. 2.0 liters hypoid transmission oil SAE 75W90 to API Class GL5 or MIL-L-2105B, or SAE 80 to API Class GL4 or MIL -L-2105."
Which one is right?:
In the end, it is up to the owner. Though statements of GL-5 use in a syncro'd tranny are somewhat against... history and sales of GL-5 lubricants (like Redline 75W90) continue to be favorable. This is a heavily debated topic, even within the industry. The only things we can assume for sure is: 1. Don't use FM in non-LSD transaxles 2. Don't add FM to make the clutches lock up sooner in LSD equipped cars.
Friction Modifier (FM) is slippery stuff. The FM is in place to reduce LSD clutch chatter upon engagement. The amount needed is relative to the application and the age of the differential. In full race cars, you want the clutch to lock up nice and strong while not being so concerned with a little chatter. In high mileage (or worn) LSD cars, the clutches will be worn and need less FM to attain the desired effect. The downside, or catch-22, is that the syncros don't need or even like the FM. In most cars this is not a problem because the differential and transmission are separated and do not share the same lubricant. Our transaxled P-cars do share, so we must prepare for that.
FM options:
FM needs to be used in LSD cars, we know that. It's the amount that is variable. As a general rule, what comes out of the bottle is sufficient for most applications. Some folks will mix FM stuff with non-FM stuff (75W90NS and 75W90) until the desired effect of "no chatter" is attained... the reason for this being again, that syncros don't like FM.
Oil weight:
In high-performance applications where the temperatures may get higher than street use, it is common practice to use a bit higher weight oil (75W90 vs. 70W80), and higher still if the tranny/diff is not externally cooled (80W140).
What about GL-5 vs. GL-4:
The main complaint against GL-5 use in syncro'd trannies is because the chemicals used to provide the extreme pressure protection can be corrosive to synchronizers, which are commonly made of brass or bronze. Here's what the 944 factory manual has this to say: "Filling capacity Approx. 2.0 liters hypoid transmission oil SAE 75W90 to API Class GL5 or MIL-L-2105B, or SAE 80 to API Class GL4 or MIL -L-2105."
Which one is right?:
In the end, it is up to the owner. Though statements of GL-5 use in a syncro'd tranny are somewhat against... history and sales of GL-5 lubricants (like Redline 75W90) continue to be favorable. This is a heavily debated topic, even within the industry. The only things we can assume for sure is: 1. Don't use FM in non-LSD transaxles 2. Don't add FM to make the clutches lock up sooner in LSD equipped cars.
10-22-2003, 06:23 PM
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Here's a link to the tech-session.com article regarding a 944 transaxle fluid change:
http://www.tech-session.com/kb/index...x_v2&id=54&c=4
http://www.tech-session.com/kb/index...x_v2&id=54&c=4
10-22-2003, 06:35 PM
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It's unlikely that you do, but check the option code sticker in the rear luggage area (behind the carpet, next to the left tail light) for the option code 220.
I fyour brand of choice is Redline, then use MT-90 or 75W90NS - your choice.
I fyour brand of choice is Redline, then use MT-90 or 75W90NS - your choice.
10-22-2003, 06:54 PM
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I think what 4runner, and others, are trying to say is that GL-4 is recommended. Not all GL-5's are created equal, but organic GL-5 (as Valvoline is) are not recommended for use. If Valvoline 75W90 is GL-5, then you probably should not use it. In my diatribe above quoted from the tech-session, I explain that "Though statements of GL-5 use in a syncro'd tranny are somewhat against... history and sales of GL-5 lubricants (like Redline 75W90) continue to be favorable. This is a heavily debated topic, even within the industry." If you call Redline, they will recommend MT-90 - if for no other reason than it is what your car specifically calls for.
10-22-2003, 07:18 PM
#15
Race Car
for what it's worth i threw in some mobil-1 75-90 synthetic and the tranny shifts fine, although no different than before.