Remove the gearbox oil filler / overflow plug with a 12mm allen socket, you will need an extension to reach it. On the GT4 you must remove a rear aluminum heat shield cover that covers the gearbox overflow plug and hole.ĩ. There is not much oil in there but I place a receptacle and funnel under the hole to catch it all and leave it there for a while.Ĩ. Let the oil drain from the transfer case. Loosen the transfer gear drain plug with a 19mm wrench.ħ. Place the receptacle under the transfer gear drain plug.Ħ. Loosen the 22mm transfer case fill plug first, because if you drain the transfer case and can't get the fill plug off, well you get the idea! (See below)ĥ. Note: I have never had any battery drain even when the car has set for over a month, some models have more drain and even need a trickle charger to keep them charged for as little as two weeks! Jonathan's note: I never disconnect the battery to change the gear oil, but be careful not to short the starter motor to ground!Ĥ. I have a green spin off knob that disconnects the battery ground cable and is very handy, not only when working on the car but when leaving it for an extended period of time as not to drain your battery. If you use jack stands make sure that they are placed so that they will not get in the way of your drain receptacle and are more importantly placed on the main tube frame in the appropriate locations.ģ. Raise car to a suitable height or use a lift, make sure the car is stable and even. Get all the supplies you need ready at hand.Ģ. Make sure all work is done on a level and clean surface, you are sober and at least someone is around, (in shouting distance) in case you have an emergency. Your family will thank you, and at you memorial I will tell them I warned you in advance and try to buy parts off your car!ġ. If you do this, make sure you have a good insurance policy. I have done this personally but I love my car more than myself. Note: Never get under your car supported only by jacks. 1 large piece of card board (To catch any oil that may splash.) Funnel and a piece of hose approximately 10 inches long.Ģ. Suitable drain receptacle to catch and recycle oilĦ. (5) Quarts suitable oil (Swepco 201 80W-90, Agip Rotra LSX SAE 75W-90, Redline 75W-90) Oil needs to have a friction additive for the clutches in the differential! (Jonathan's note: Many people including me have had excellent results with Redline 75W-90 NS).Ĥ. Please give me feedback, as I am in the slow process of becoming an amateur Ferrari mechanic! Respectfully, Rob (Robertone) Garven (This article was originally published here on )ġ. I also had help from several experienced Ferrari mechanics whose names will be withheld as not to embarrass them with my acquaintance! I am also on several other Ferrari lists, as I am a nut and have all this free time when I am not working 10 hours a day! :-) I hope you enjoy what I have written and I can help some other poor soul who was as lost as I was 12 years ago. I started on the original and met many members who guided me along the way, many are here now also. As most of you may or may not know, I decided 11 years ago that I wanted to do my own work as I loved my car so much I couldn't trust anyone to touch my precious Ferrari. I am working on a book "Ferrari Service for Dummies or What I Learned on the Internet" If you find any mistakes please let me know and I will revise it. My dream is to share what I have learned working on my 1975 308 GT4. Changing the gear oil on a Ferrari 308 or MondialĬhanging the gear oil on a Ferrari 308, 328 or Mondial
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