![]() ![]() It was moderately stiff when really cold, but it was warm enough to be okay within 5 minutes. I was satisfied, but the 1-2 shift was still too stiff for my taste. I swapped it out right away.Ĥ) Redline D4 - this made my shifts feel like they did when it was stock, before the short shifter. I seem to recall that shifts were even stiffer than GM Synchromesh to the point where I didn't even like driving it. ![]() I thought I would give it a chance in the Getrag. All shifts were stiffer and it really didn't like being cold.ģ) Redline MTL - I tried this in the Tremec, but it didn't match up well. I tried this first in my 128i, but it did not work well. I also use it in the Tremec T-5 in my Mustang. I installed it when the car had about 70k miles and used it from then on until 243k miles without a hitch. It worked like a miracle in my well-worn Honda. It was okay with the stock shifter, but once I went to the short shifter, it was just too stiff, even in summer.Ģ) GM Synchromesh with friction modifier - this has always been my go-to oil. The car was a little better when it was stock, but ever since I installed the BMWP short shifter, the force required became unpleasant.ġ) OEM - the OEM oil had 68k miles on it when I bought the car, but BMW does claim that it's a lifetime fill (har har). I had no grinding issues, but the synchros were definitely working too hard and not meshing the gears easily. I've never liked the force required to shift from first to second in the Getrag, even when warm. You need the correct weight to keep the gears from bogging down and dropping too much speed between shifts and you need the right friction coefficient for the synchros to grab properly and mesh the gears. I've heard naysayers warn against non-OEM oils and how they'll lead to premature wear only to drive a car 243k miles and still shift smoothly to the end.Īgain, I'm not an oil expert, but IMO smooth shifts are a combination of oil weight and friction modifiers. Every transmission likes something different and I've never found the OEM oil to be the best. I'm by no means an expert, but I have changed gearbox oil at least a dozen times in three different gearboxes over the years. This fluid is less slippery for improved synchronizer coefficient of friction and offers stronger film strength for better wear protection.I finally found it, the holy grail of gearbox oil for the Getrag transmission - Redline MT-LV! This shear-stable formula resists breakdown for extended periods and offers more consistent viscosity in warm and cold temperatures for less gear noise and improved shifting. RED LINE MT-90 HIGH-PERFORMANCE GEAR OIL is a fully-synthetic ester-based lubricant designed for use in manual transmissions and front-wheel-drive transaxles. ![]() MTL & MT-90 are not for use in differentials with hypoid gearsĮxcellent gear and synchro protection, balanced slipperiness for easier shifting in cold climatesĮxcellent for high- and low-mile transmissionsĬompatible with petroleums and other synthetics Red Line offers lubricants to pinpoint nearly every transmission application Recommended for GL-1, GL-3, and GL-4 applications, as well as where most special synchromesh fluids are specifiedĪBOUT RED LINE GEAR OIL FOR MANUAL TRANSMISSIONSĪppropriate coefficient of friction for most manual transmission synchronizers (other's synthetic gear oils are often too slippery for proper synchro engagement) Satisfies the gear oil viscosity requirements of 75W90, 80W90, 90 and motor oil viscosities of SAE 40, 10W40, and 15W40 High performance gear protection and longer synchro lifeĮliminates notchy shifting, even when cold Safe for brass synchros, as it lacks the reactive sulfurs found in most GL-5 oils that cause damage Offers quicker shifts, perfect synchronizer coefficient of friction Popular in Nissan, Mazda, Mitsubishi, VW/Audi, Lotus Elise/Exige, Toyota, Mendeola transmissions and Atlas transfer cases for Off Road It p rovides excellent protection of gears and synchronizers and its balanced slipperiness provides a perfect coefficient of friction, allowing easier shifting.ħ5W90 GL-4 gear oil (similar to SAE 5W40/10W40 engine oil viscosity) This is a 75W90 GL-4 Gear Oil that's slightly heavier than MTL. ![]()
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