If anyone has changed the manual transmission oil after break in, what was it like?

[formulaBRZ]

Originally Posted by KillerBMotorsport

Nothing exciting to add here except that our unit's trans is very different from cold-to-warm. When cold it's got more noise, notchy, and difficult. Not so much when warm/hot.

Seconding this, mine feels like a completely different transmission after the first 10 minutes. Nothing unusual just cold. Notchy is the perfect word to describe it.

[NoHaveMSG]

Originally Posted by Mcgiiver

I was at a Volvo Service Dept one time and on their services pricing sign on the wall it said "Exhaust Service $95" , not sure what an exhaust service is, maybe cleaning soot off the tailpipe.

That sounds like something people who drive Volvos would pay for.

[x808drifter]

Originally Posted by dragoontwo

So is it 75w-80, 75w-85, 75w-90 or maybe 75w-140?

And to be more pedantic.
He said 75W LV.
Nothing after that. (IE: No 75W-anything)

So I assumed it asked for a straight weight oil.

[dragoontwo]

Originally Posted by x808drifter

And to be more pedantic.
He said 75W LV.
Nothing after that. (IE: No 75W-anything)

So I assumed it asked for a straight weight oil.

If that were the case it would just be SAE75. It's 75w-something.

[eyeballs]

Originally Posted by joro2

So, ripped off? I know, dealer is always a rip off (although as I said these services all seemed competitively priced). What's your opinion on the trans/diff fluid change at 5.5 years/21K miles? And what is that "alignment and fuel induction service"?

It's been quite a number of years....but my first new car was a 2003 WRX and the SFL suby dealers were so bad I refused to take my car there and instead learned how to do stuff myself. Thankfully the suby auto-x community down there was amazing at the time and helped me jump in with maintenance and mods.

[Mcgiiver]

Originally Posted by x808drifter

That tell you EXACTLY what the viscosity will be at operating temp.
You know how oils work right?

Wrong, 75W tells you the viscosity at cold temps, not operating temperature.

[Mcgiiver]

Originally Posted by Mcgiiver

The spec in the owners manual says 75w LV, that tells you nothing about the viscosity at operating temperature, so I sent the following to Subaru on Sept 30 and have yet to get a reply. I did get a case number assigned to my inquiry.
"Subject: manual transmission oil
Comments: I own a 2022 BRZ and want to change the manual transmission oil. The owners manual specifies GL-4, 75W LV oil. Trans oils are usually specified like 75W-80, 75W-85, 75W-90, with the second number being the viscosity at 100 degrees C. No 100 degree viscosity is given in the manual. I would like to know what is the recommended 100 degree viscosity so I may purchase an oil that meets Subaru specifications. The Toyota recommended 75W LV oil is insanely expensive so I want to use an aftermarket equivalent, but I need the specification. "

Update. Subaru of America got back to me and said they don't know what the viscosity at operating temperature of the trans oil should be. They suggested I talk to the dealer. Great, that instills a lot of confidence.

[x808drifter]

Originally Posted by dragoontwo

If that were the case it would just be SAE75. It's 75w-something.

Funny...
Can find a bunch of straight weight gear oils listed for sale as 75W nothing after that.

Originally Posted by Mcgiiver

Wrong, 75W tells you the viscosity at cold temps, not operating temperature.

Go up 3 posts. READ AGIAN

[Squirrely]

Originally Posted by x808drifter

Funny...
Can find a bunch of straight weight gear oils listed for sale as 75W nothing after that.



Go up 3 posts. READ AGIAN

Correcto. No dash means same hot or cold.
Fun fact: Multi-weight oils didn't come out until the early 1950s, before that everything was a single weight. I had an old Chevy with a big in line six that used straight 40w. It would burn through anything else (probably because it needed new rings).

[Caithness]

At about 8000 miles and half a dozen days on track I changed the transmission and differential lube to the Ford Motorcraft XT-M5-QS 75w90. The transmission had gotten very notchy and started whining. When I drained the original 75w transmission fluid it smelled very bad- burned smell, very dark, had a lot of metal in it, and had the consistency of water. The original 75w90 differential lube was a bit better in that it still resembled a lubricant but was dark and had a ton of particulates in suspension and stuck to the drain plug.

After the change the transmission shifted noticeably better and the whine quieted down. Seeing these results I plan on changing at least once a year or every 5-6 track days at a minimum. I hope the 75w90 in the trans holds up better than the OEM 75w.