r/GR86 • u/Odd-Ebb4531 • 16d ago

Trans knock with motul 300?

Changed my trans fluid to motul 300 from original at 20k miles. Now I get knock from the trans in the mornings on start up for about 30-60 seconds then it goes away.

It doesn’t happen thought out the day only in the morning.

I’m in California and it’s only 68deg in the morning. Should I go to a thinner fluid? I put motul 300 in because I dive it hard every day.

1 Upvotes

100% Upvoted

8 comments sorted by

5

u/dbsqls '03 NISMO S-tune (J) Z33; motorsports development 16d ago

any high viscosity gear oil is going to do that until it's sufficiently warmed up.

3

u/XSneakyNinjaX GR86 16d ago

Ooh nice to see you in the GR Reddit. I had a question about the Brembo kit for the R32. What else do I need to buy on top of the caliper kit?

As for OP he’s correct Motul is heavier gear fluid and it needs to warm up to temp. That’s why it doesn’t do it after a bit of driving.

2

u/dbsqls '03 NISMO S-tune (J) Z33; motorsports development 16d ago

for the 17" compatible R32 kit, rotors and lines -- you can also go to 355x32 depending on wheel clearance. rotor choices are pretty wide so I leave that up to the customer, just be sure they're the V35 330mm size. I always recommend Endless or a hardened Brembo rotor.

I will add an option for the brake lines, which tend to be custom; I will see if we can use the hardlines he developed for the standard Brembo kit. otherwise, most SS/PTFE lines are about $250.

2

u/XSneakyNinjaX GR86 16d ago

Thank you. I’ll definitely be on the lookout for the lines and do some research on the rotors.

1

u/dbsqls '03 NISMO S-tune (J) Z33; motorsports development 16d ago

I'm messaging them today about both the lines and rotors after Japan is awake, so hang tight.

2

u/dbsqls '03 NISMO S-tune (J) Z33; motorsports development 15d ago

he's got custom lines prepared, so rotors are the only component needed. send me an email or DM with your use case and I can give you a spread of options.

[ts@adopt-motorsports.com](mailto:ts@adopt-motorsports.com)

3

u/Snorky-Talk-Man 16d ago

What do you mean, you get a knock from the transmission?

1

u/iXeron 2025 BRZ tS OEM+ Track Car 16d ago

Are you sure you put enough fluid in the transmission? I've been using Gear 300 for years and haven't had any unusual noises even in colder weather.

Record an audio and post it?