I have an aging (but wonderful) 2004 Subaru Impreza WRX with a manual gearbox. For some time, I have noticed that the synchros have begun to feel worn with the stock dealer-issue oil. Shifts are slower to the point of being chunky going into or out of fourth gear.
I have heard about Redline Lightweight Shockproof and was looking for two answers:
Is this an appropriate oil for the transmission in question (i.e., any risks)?
Is this an appropriate oil for the symptoms?
Basically, this is my daily driver with an enthusiastic (but not idiotic) driver. I'm looking to improve the cars quality of life without any intention of dropped clutches at a green light.
EDIT to follow-up on the answer: I've tried to keep this car up nicely. All scheduled maintenance is up to date with 110000 miles (and now 190K miles!) on the odometer. Things like oil, suspension and exhaust work I handle myself but I let the techs have some time to play as well....