# S14 trany What Kind of Oil

**URL:** <https://forums.speedlife.net/t/s14-trany-what-kind-of-oil/106876>\
**Category:** SON240sx Automotive\
**Created:** [May 25, 2007, 2:19pm UTC](https://forums.speedlife.net/t/s14-trany-what-kind-of-oil/106876 "2007-05-25T14:19:35Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![G-E](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/g-e/32/5546_2.png) [@G-E](https://forums.speedlife.net/u/G-E)\
**Post date:** [May 27, 2007, 12:52pm UTC](https://forums.speedlife.net/t/s14-trany-what-kind-of-oil/106876/6 "2007-05-27T12:52:54Z")

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> [@5/31 S&R cruise night](https://forums.speedlife.net/t/5-31-s-r-cruise-night/12700/14):
>
> Your owners manual should list the type of fluid to use. I know the S13 lists a GL4 grade oil and most stores only sell GL5.
> 
> I do suggest a bit of reading before purchasing oil as I’m running GL5 and noticed my 3rd gear syncro doesn’t spin up as fast.
> 
> Mark, John both experienced me grinding third gear while at the track…

gl5 typically destroys the baulk rings in nissan trannys that’s why, you need gl4 where it says gl4 unless you get a full synthetic fluid which explicitly states it is safe for all gl4 applications

so if you don’t want to grind, stick to redline or whatever gl4 you can find, it’s not worth killing the tranny

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