 GL-5, much better than GL-4 |
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| 930cabman |
 Jun 16 2024, 10:05 AM
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#1
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Advanced Member  Group: Members Posts: 4,123 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States 
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Not sure how or why I had been running Sta-Lube GL-4 for the past several years ago, but I switched to Sta- Lube GL-5 this year and have a noticeable change.
Old gearbox and I have no idea of the state of repair, but a GL-5 change is a big (IMG:style_emoticons/default/beer.gif) |
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| technicalninja |
Jun 16 2024, 10:16 AM
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Advanced Member Group: Members Posts: 2,531 Joined: 31-January 23 From: Granbury Texas Member No.: 27,135 Region Association: Southwest Region
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In what way has it been better?
GL4 is for manual transmissions that DO NOT have a differential in them. GL4 does not have "extreme pressure" additives. In a modern transmission the EP additives can coat the synchronizers and make them not work properly. The differential NEEDS the EP stuff bigtime... I wouldn't have thought you could feel the difference between the two. I also would expect early diff failure without it. It's the hypoid gears that need it, not the bearings. The early synchronizes seem to be less picky than the late ones. Most of the late ones have 2 or 3 different brass pieces versus the original single synchronizers. Late seem better IMO but don't work well with GL5. |
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| 930cabman |
Jun 16 2024, 05:34 PM
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#3
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Advanced Member Group: Members Posts: 4,123 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States
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QUOTE(technicalninja @ Jun 16 2024, 10:16 AM)  In what way has it been better? GL4 is for manual transmissions that DO NOT have a differential in them. GL4 does not have "extreme pressure" additives. In a modern transmission the EP additives can coat the synchronizers and make them not work properly. The differential NEEDS the EP stuff bigtime... I wouldn't have thought you could feel the difference between the two. I also would expect early diff failure without it. It's the hypoid gears that need it, not the bearings. The early synchronizes seem to be less picky than the late ones. Most of the late ones have 2 or 3 different brass pieces versus the original single synchronizers. Late seem better IMO but don't work well with GL5. Probably the most improvement is finding 1st gear when stopped. I generally leave the trans in neutral at a stop light and engage 1st gear when the light turns. Also, finding third is often tight, but seems easier after changing to GL-5 |
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Posts in this topic
930cabman GL-5 Jun 16 2024, 10:05 AM
porschetub
In what way has it been better?
GL4 is for manua... Jun 16 2024, 10:50 PM
emerygt350 On a safety point, and perhaps to avoid the grind,... Jun 16 2024, 05:50 PM windforfun
Not sure how or why I had been running Sta-Lube G... Jun 16 2024, 06:21 PM bkrantz Based on the recommendation of CMS, who did the re... Jun 16 2024, 08:05 PM windforfun Is that stuff blue in color? If so, I use the sam... Jun 16 2024, 08:14 PM 930cabman It seems as though the synchro's like the GL-5... Jun 18 2024, 08:45 AM |
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