Stephanie and I are driving to California this coming saturday to spend a week roaming around San Francisco and Yosemite. Before I put that many miles on my car, I wanted to replace my oil and transmission fluids. On saturday I suckered my friend JT into giving me a hand because, well, I am still down one hand. On friday I went to get my fluids from the local Subie repair shop, and discovered that they didn’t have any of the fluids I was looking for despite what they told me on the phone.
The oil was no big deal because I am going to have to change it out after the trip anyways. So, I just put in Mobil 1. The transmission and rear diff are another story. Since these are only changed out every 30K miles, I didn’t want to settle for what they had. So, I did some searching and found a company called 3R Racing. Saturday morning I gave them a call and they had what I was looking for. Jt and I hopped in the car and drove the 45 minutes to the south side of denver. We got there and discovered that this place is a supply store for actual race cars. Being careful not to accidentally grab something absurdly priced (like a $75 quart of brake fluid), I get the Redline 75W90NS for my transmission and 75W90 for my rear diff.
75W90NS: “This GL-5-type geal oil doesn’t contain the friction modifiers for limited-slip hypoid differentials. This makes the transmission synchronizers come to equal speeds more quickly, allowing faster shifting and much easier low-temperature shifting. Can also be used in racing limited-slip differentials where weak spring design causes too much wheel spin.” (by way of Redline Oil)
I chose this fluid because the WRX 5sp is a quirky transmission. It is honestly a bit of a pain in the ass. It grinds if you are not careful, getting into first gear can be interesting, and it is generally just odd. I have read from a couple of MTF whores on NASIOC that this is one of the better working oils for this transmission, so I thought I would give it a shot.
Back at JT we set to work. First up we pulled off my front rotors and took them to be turned. Next we replaced the oil. We quickly discovered that the shop had given me the wrong oil filter. Back to the auto parts store. Our final pain was getting the rear diff fluid into the car. Obviously the people at Redline don’t expect hillbillies to be doing this work in thier driveway, so their bottle is not designed to make this easy. With a water bottle, rigid hose, and some electrical tape we rig together a way to get the new fluid into the fill whole.
Eerything assembled and I get the car started again. Watching the engine temp I check and make sure there are no leaks or odd sounds. The tranny whines for the first 30 seconds or so after starting, then that goes away and everything sounds normal. I let the engine come up to temp and then power it off and check the levels.
The transmission is definately a bit nicer now. Engaging first is better, and there is a good decrease in the amount of force needed to shift. No miracles, just a small but significant improvement. Unfortunately I have heard that this only lasts a few thousand miles and then it will get back to it’s old self…
gnubbs