Lucas gear oil
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This is a discussion on Lucas gear oil within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; I couldnt find any gl5 dino gear oil at the local auto store but I did find "Lucas High pwerformance ...

  1. #1
    Registered User BrandonWRX's Avatar
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    Lucas gear oil

    I couldnt find any gl5 dino gear oil at the local auto store but I did find "Lucas High pwerformance havey duty 80/90 plus gear oil" to top off my tranny which seems to be about 1/2 qt low. It says this oil replaces 80W90 and gl5 even gl6 rated gear oils. "Excellent for use in limited slip differentials with no special additive needed....excellent for use in race cars, trucks, rv, hypoid gears"
    i know 1/2 qt wont matter much but I wionder if anyone has experience running straight Lucas gear oil, which exceeds gl5 classification. Since it is a little thicker than 75W90, I figure the synchros might like that.

    http://www.autobarn.net/luc10043.html
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  3. #2
    Registered User cyrilgrey's Avatar
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    I'm running it mixed in the transmission, and straight in the rear diff. Feels good, no complaints.

  4. #3
    Registered User BrandonWRX's Avatar
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    well I put in half a quart and I am surprised at how much it improved. There is still some notchyness but thats normal. The slight grinding has gone away and I can shift into 1st more easily. Also the 1-2 shift is a lot smoother. I wonder how straight Lucas oil or some 50-50 mix of dino 75W90 and lucas 80/90 (80W90 synthetic) would feel. especially with fall coming up and colder mornings.
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