# Misunderstanding oil classifications

**URL:** <https://forums.speedlife.net/t/misunderstanding-oil-classifications/216596>\
**Category:** SON240sx Automotive\
**Created:** [September 16, 2011, 12:56pm UTC](https://forums.speedlife.net/t/misunderstanding-oil-classifications/216596 "2011-09-16T12:56:31Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![danscomp](https://avatars.discourse-cdn.com/v4/letter/d/838e76/32.png) [@danscomp](https://forums.speedlife.net/u/danscomp)\
**Post date:** [September 16, 2011, 12:56pm UTC](https://forums.speedlife.net/t/misunderstanding-oil-classifications/216596/1 "2011-09-16T12:56:31Z")

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So I was told NEVER to put GL-5 gear oil in for my tranny, but every oil I see says “meets GL-4 and GL-5 specifications”

So would that oil be acceptable to run or is there a specific oil to use? I called napa, part source and nissan and none of em had a straight GL-4 oil. I’d like to change the tranny oil when I do my coils this weekend so if anyone knows that’d be amazing.

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**Author:** ![Cadence](https://avatars.discourse-cdn.com/v4/letter/c/9e8a1a/32.png) [@Cadence](https://forums.speedlife.net/u/Cadence)\
**Post date:** [September 16, 2011, 1:44pm UTC](https://forums.speedlife.net/t/misunderstanding-oil-classifications/216596/2 "2011-09-16T13:44:00Z")

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Car Quest has GL-4 Pennzoil.

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**Author:** ![MP\_B240](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/mp_b240/32/5697_2.png) [@MP\_B240](https://forums.speedlife.net/u/MP_B240)\
**Post date:** [September 16, 2011, 4:00pm UTC](https://forums.speedlife.net/t/misunderstanding-oil-classifications/216596/3 "2011-09-16T16:00:56Z")

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“meets GL-4 and GL-5 specifications” means either would work. so yeah, you can use it.

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**Author:** ![derass](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/derass/32/5691_2.png) [@derass](https://forums.speedlife.net/u/derass)\
**Post date:** [September 16, 2011, 5:00pm UTC](https://forums.speedlife.net/t/misunderstanding-oil-classifications/216596/4 "2011-09-16T17:00:22Z")

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Both amsoil and redline have gl4 transmission oil. Find a dealer.

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**Author:** ![Cadence](https://avatars.discourse-cdn.com/v4/letter/c/9e8a1a/32.png) [@Cadence](https://forums.speedlife.net/u/Cadence)\
**Post date:** [September 17, 2011, 1:43pm UTC](https://forums.speedlife.net/t/misunderstanding-oil-classifications/216596/5 "2011-09-17T13:43:39Z")

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local parts source should have amsoil.