![]() So, they reduce the amount of this additive for the brass-content transmissions and give the oil a GL-4 rating. The most common EP additive is a phosphorous-sulfur compound that is corrosive to brass at the concentration used in a GL-5 oil. GL-5 oils constitute the bulk of gear oils at the local auto supply store. GL-5 gear oils differ from the GL-4 oils in the Extreme Pressure (EP) additive. GL-4 oils are for transmissions that contain brass or bronze parts. I believe VW specifies a 80-90w gear oil with a GL-4 rating for the 020 transmission. Mobil 1 synthetic is not GL-4 rated, according to the label on the bottle. The first thing to realize is that generally, there are two different types: GL-4 and GL-5, among the various weights. Do a search on transmission fluid and one will find multitudes of opinions, and some surprisingly contentious threads. It turns out that deciding what transmission fluid is not as simple as selecting an engine oil. Do not use GL5 as it contains extra additives which will harm your trans. Modified by groggory at 3:32 AM 5-31-2007 Modified by groggory at 2:16 PM 5-25-2007 Modified by groggory at 2:13 PM 5-25-2007 Modified by groggory at 10:54 PM 5-8-2006 Fluid Pump or funnel with long flexible tube You can purchase this tool at Metalnerd Part #Part MN2567 - Gear Box Drain Bit or draper part number # HDPK1 The manuals refer to it as tool #2567 and tool #3357. Some newer VW's, Porsches, and Audi's have replaced the hex screw with a special star screw. 17mm hex, preferrably socket drive so you can torque the bolts, but a standard hex key will work. Replace Plastic Under Engine Tray and put the (4) T25 Torx screws back in. This is important so you can check for leaks later. Torque check plug and drain plug to 25 ft*lbs Install Fill plug (apply anti-seize to threads before installing) Fill until you see a bit of oil oozing out the bottom of the check hole. According to bentley the check plug is the fill line. Put in 2.1 Liter (per mk4 bentley) of gear oil back in. Install Drain plug (apply anti-seize to threads before installing) Dispense a small amount of clean oil into transmission check hole to flush out any debris left at the bottom. Put long funnel and tubing from engine compartment or feed a line to your fluid pump Note: Check plug and drain plug are identical unscrew drain plug (on bottom rear of transmission, 17mm hex or special tool *) unscrew check plug (on side of transmission facing driver side, 17mm hex) Remove Under Engine Plastic Tray by first removing the (4) T25 Torx Screws holding it in place jack it up on level ground (Car must be level) Just make sure you change it on a level surface and you fill it to the very bottom of the check hole. Note: You do not need to change the transmission oil at a particular temperature. They make GL4 + GL5 compliant oils (these are ok) Also, the GL5 is too slick and your synchro relies on a bit of drag. Use Pennzoil Synchromesh at your own risk (not GL4 OR GL5 rated, but seems to work very well) After reading some 38k miles blackstone reports that this fill turned to 10W oil. Factory Fill Part # G 005 100 A1 (Not recommended. It's an updated formula and is fully synthetic. ![]() I used this because it was recommended on comments and couple threads on vortex.įactor Fill Part # G 070 726 A2 - Highly recomended IMO It still definitely feels better than the OEM stuff. I've been getting 90F temperatures in my area lately and shifting isn't notchy at all driving for about an hour. So far Shifting with MTL-R is a little notchy when cold, but once it warms up it's smooth again like the Redline stuff. No known long term testing of this oil.please comment if you've used this Chevron Delo 80w90 (This is GL4+GL5 Boron Based, so it won't hurt your synchro. Redline MT90 (Slow to warm up, but wonderful once it does) This is reportedly sold as GM Synchromesh, Part#12377916 BG Ultraguard 75W90 Full Synthetic, Part#750 (NOT #750A) Ok, a few questions I've pulled after a good amount of research. Also, there may be slight differences in the under-engine plastic shields. There is an updated tool you need to buy if you want to follow this procedure on the Mk5. Note that for Mk5 Cars they changed the drain & Fill plug style. The procedure will be very similar on an 02a, 02b, 02c, and 02d type transmission. To preface, this is for an '02 GTI 1.8t 5spd.
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