Kudos to Mobil 1 75w 90 syn gear lube

JeffO · 05-10-2006, 04:37 PM

Just changed out the tranny fluid to baseline my Carrera, and must say that my tranny shifts real nice now.When it warmed up the shift feel was excellent. I think it was the first change out since new, so 86000 miles and 19 years has to make a difference. Also I bought a pump from NAPA for 7 dollars and it made for a real easy fill.

Weaver · 05-10-2006, 04:46 PM

JeffO, I was just about to do the same on my '88. I can't seem to find where to fill the box. I looked it up in my Bentley manual, but it seemed vague. Very unlike Bentley. Anyway.

Thanks

Motorhead-45 · 05-10-2006, 04:47 PM

Excuse my ignorance but is that a G50 or 915 in the 1988?

Puka Puncha · 05-10-2006, 04:49 PM

I still can't locate a 17mm allen wrench

. Been to Checker 2x...

JeffO · 05-10-2006, 04:51 PM

Its the G-50, and the fill plug is on the top side of the tranny. Open this first. Then drain the fluid. That way you do not drain then realize you can not fill.

JeffO · 05-10-2006, 04:56 PM

It's a ten millimeter allen. I had one in the factory tool kit , but bought one at the hardware store so as not to bugger up the OE one.

oliver88 · 05-10-2006, 05:10 PM

Did you use this one:

http://www.lufteknic.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=Mobil75-90SHC&Category_Code=lubricants

or the Autzone available one?

JeffO · 05-10-2006, 05:21 PM

I bought the Autozone 1 quart bottles, but when I checked the Mobil web site I only remember seeing one choice.

Robby Robinson · 05-11-2006, 11:04 AM

I also use Mobil 1 in my G50. I drive my car year-round and in cold weather I believe it has made quite a difference.

Fill plug was on the driver's side of the tranny, and drain hole on bottom. I used a long piece of vinyl tubing and filled directly from the bottle. When oil starts to run out of the fill hole, stop. A full trans case should be just up to the bottom of the side hole.

Puka Puncha · 05-11-2006, 11:42 AM

So is it a 17mm allen or 10mm allen to remove the plug? I read it was 17mm...

Thanks

Wil Ferch · 05-11-2006, 11:46 AM

1985 takes a 17 mm...

Wil

Puka Puncha · 05-11-2006, 11:55 AM

Thanks Wil

Wavey · 05-11-2006, 12:00 PM

I've found that "level with the bottom of the fill hole" is different if only the back of the car is raised, vs raising the whole car. Definitely holds more with the car level, so I raise the whole car on jack stands when doing this. Of course a lift would do the same thing...

slotcar · 05-11-2006, 12:03 PM

Breaker Bar (longer the better) do not try to remove the filler or drain plug without a long breaker bar...hex socket, and PB blaster (you do not want to strip those plugs). Best to replace with new plugs if you have the chance...

Bill Verburg · Bill Verburg's Garage

'85 & '86 Carrera are 915, '87 - '89 are G50