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In another thread I read that pennzoil SAE 80W is the oil to choose for those old manual shifters. As with many stuff recommended on this forum , this isn't available in Europe (at least not in the Netherlands). Is this Pennzoil SAE 80W the same as Shell SAE 80W? At the Porsche delership I cannot buy oil. I only can buy an oilchange, but the gearbox is out so this can't be done.
Does it really make a differnce which SAE 80W I put in the gearbox? As I understand, the difference is in shifting to second gear. There are quite a lot of transmission oils around, SAE 80W/90 is what they use at Porsche. I thinkit is Mobil-1.

Hilton

Fuchs make some good synthetic (Group IV) oils in a variety of GL/weight combinations. I recently bought some of their GL5 80W diff oil for my wife's XC90 and it was the only oil available locally other than Motul ($$$!) I could find which met that spec. I'm pretty sure Fuchs oils can be bought in Europe too?

The question I have is which GL rating should be used for the 78-82 4.5L cars? Is it in the WSM?

The quick search I did in owners manuals shows Dexron (the original formula which as discussed in other threads, is not appropriate since they stopped making it out of whale oil).

The later cars specify GL5, which is common for transaxles, as GL5 specifies higher amounts of extreme pressure additives, so reduces wear from the high torque loads in the differential. GL4 is better suited to transmissions rather than differentials/transaxles (as the torque loading is lower in a transmission), and includes better anti-wear additives for sycnro's, at the cost of extreme pressure additives.

For the early 4.5's, I wonder whether the use of GL5 oils is a factor in the syncro-wear issue?

Hilton

The 78-80 Dimensions/Tolerances booklet states:

And states that for the auto diff's:

GregBBRD

Tech Bulletin #8313.

"Transmission oil labeled API service classification GL5 or MIL-L-2105B must be used in all Porsche models." Oil classification such as GL6 and GL7 may cause synchronizer failure and are not recommended."

GregBBRD

Find some Mobil 1 75/90 LS gear oil. Works great. Thin enough for these early gearboxes to shift when they are cold and thick enough to prevent gear wear.

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I found the following transmission oils with GL5 classification:

Mobil Delvac™ Synthetic
Gear Oil 75W-90
Heavy-duty manual transmissions, axles and final drives requiring API GL-5 and MT-1 performance
On-highway light and heavy-duty trucks, buses and vans
Mobil Delvac Synthetic Gear Oil meets the following industry and builder specifications:
API GL-5/MT-1
SAE J2360
Scania STO 1:0
http://www.mobil.us/USA-English-LCW/...il-75w90.aspx#

Mobil Delvac™ Synthetic
Gear Oil 80W-140
Heavy-duty manual transmissions, axles and final drives requiring API GL-5 and MT-1 performance
On-highway light and heavy-duty trucks, buses and vans
Mobil Delvac Synthetic Gear Oil meets the following industry and builder specifications:
API GL-5/MT-1
SAE J2360
Scania STO 1:0
http://www.mobil.us/USA-English-LCW/...il-80w140.aspx

I think I'll go for the 75W-90

9two8

I have used this company before and their customer relations is second to none, with any questions you may have regarding oil types, they deliver to Europe as well. (No affiliation )

http://www.opieoils.co.uk/basket.aspx

Ken
80 928 S
5 Speed

UK

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Why is it so hard to find the Mobil-1 GL5 gear oil? Nobody seems to sell Mobil-1 gear oil in the Netherlands. Does it really make a difference what brand I use witin the same viscosity spec?

GregBBRD

No. Find any one of the 75/90 or straight 80 weight grades and use it.

I'd think that the Mobil Delvac Synthetic 75/90 you found would work great.

Some of the synthetics have issues with leaking past seals (I've found that Redline will leak past new seals, but that it does better if the seals are old....probably a function of how wide the sealing lip is), but you won't know if that is an issue until you try it.

mark kibort

I found the early transmissions really like swepco 75-90.

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Here we go again. Every distributir around here only sell Swepco 210 Multigrade gear oil 80-140

mark kibort

can you buy it on line and have it shipped to you? its really good stuff

9two8

[QUOTE=mark kibort; can you buy it on line and have it shipped to you?

Thats exactly what I told him with the Opie oils link above, they ship to Europe untill he contacts them he will never know

Ken
80 928 S
5 Speed

UK

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[QUOTE=9two8;11943291][QUOTE=mark kibort; can you buy it on line and have it shipped to you?

Thats exactly what I told him with the Opie oils link above, they ship to Europe untill he contacts them he will never know

Ken
80 928 S
5 Speed

UK[/QUOTE]

I actually found a local Porsche workshop that sells the Swepco 201 and 210 transmission oil. In Rotterdam, about 15 miles fro my home, en route to the place where my 928 is waiting for me. http://www.pimpmyporsche.nl/pmp/prod..._201_gear_lube

Wisconsin Joe

Have you talked to any of the distributors?

Most of them will only stock what they can sell.
But most of them can get anything in the catalog if they want to.

Some will charge extra for "special orders" others will do it for no extra charge as long as you are willing to wait until the next order that they place.

I have a car parts store locally that will do that. If I need something that they don't normally carry, I can get it in a couple days for a "special order" price, or I can wait (usually only an extra week or two) for them to place their usual order from that supplier and they'll add whatever parts I need to the order for no extra charge.