 Oil type for our 901 gearbox's, GL5 or GL4 80/90 ? |
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| porschetub |
 Jun 21 2023, 10:19 PM
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#1
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Advanced Member  Group: Members Posts: 4,706 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None  |
Changing oil in my VW Corrado and it makes more sense to buy 4L pack so I can do the 914 with the remaining 2L left.
Not trying to be cheap but more $$ sensible as oil is very expensive compared to the US, My last oil change on my A6 TDI 3.0 was 24.50nzd /litre for a quality brand longlife. TIA ,cheers. |
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| MM1 |
Jun 22 2023, 01:04 AM
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#2
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914 obsession continues Group: Members Posts: 608 Joined: 9-May 18 From: Thousand Oaks, CA Member No.: 22,105 Region Association: Southern California 
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QUOTE(porschetub @ Jun 21 2023, 11:19 PM)  Changing oil in my VW Corrado and it makes more sense to buy 4L pack so I can do the 914 with the remaining 2L left. Not trying to be cheap but more $$ sensible as oil is very expensive compared to the US, My last oil change on my A6 TDI 3.0 was 24.50nzd /litre for a quality brand longlife. TIA ,cheers. Prices are ridiculous here (and around the world) too, so I hear ya. I'm switching to Costco synthetic (engine oil) since Mobil 1 is so much more expensive (at Costco now). I'll defer to Dr. Evil, but I believe he recommends "Dino"-based GL5 . . .there's a thread here somewhere - hopefully one of the braintrust will chime in . . . |
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| VaccaRabite |
Jun 22 2023, 06:19 AM
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#3
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En Garde! Group: Admin Posts: 13,465 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
I've been running 90weight oil in mine for years. At the time it was what Mike recommended. In the last 15 years he may have upgraded his recommendation, but the 90wt dino certainly works and is cheap.
Zach |
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| r_towle |
Jun 22 2023, 09:13 AM
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#4
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Custom Member Group: Members Posts: 24,591 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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Capn Crusty would be yelling
GL5 90 weight non synthetic is what the transmission, and specifically the syncros , are designed for. Anything else could cause premature wear. Rich |
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| mepstein |
Jun 22 2023, 09:30 AM
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#5
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914-6 GT in waiting Group: Members Posts: 19,316 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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Non synthetic. The cheap stuff. It’s also the right stuff for the trans.
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| Dave_Darling |
Jun 22 2023, 05:25 PM
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#6
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914 Idiot Group: Members Posts: 14,991 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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The Cap'n and Doc Evil both say: GL5 NON-synthetic, and change it often. (Annually.)
--DD |
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| JamesM |
Jun 23 2023, 01:00 PM
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#7
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Senior Member Group: Members Posts: 1,916 Joined: 6-April 06 From: Kearns, UT Member No.: 5,834 Region Association: Intermountain Region |
QUOTE(mepstein @ Jun 22 2023, 07:30 AM) Non synthetic. The cheap stuff. It’s also the right stuff for the trans. (IMG:style_emoticons/default/agree.gif) (IMG:style_emoticons/default/agree.gif) (IMG:style_emoticons/default/agree.gif) 80/90 I find the cheaper stuff tends to actually work better. All the added friction modifiers in the pricier stuff just doesent play nice with old syncros. Only part of the car where i intentionally aim for the cheapest stuff possible. |
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| JamesM |
Jun 23 2023, 01:04 PM
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#8
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Senior Member Group: Members Posts: 1,916 Joined: 6-April 06 From: Kearns, UT Member No.: 5,834 Region Association: Intermountain Region |
QUOTE(Dave_Darling @ Jun 22 2023, 03:25 PM) The Cap'n and Doc Evil both say: GL5 NON-synthetic, and change it often. (Annually.) --DD Ill have to add that to my yearly maintenance as I have not been nearly that aggressive with the gear oil. Seems almost wastefull as i dont think any of my 914s see even a 1000 miles a year anymore since i moved to Utah. Also I have to multiply that change by 4x 914s And I REALLY hate the smell of gear oil. Like REALLY REALLY hate the smell |
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