Mobil 1 LS 75W-90 Ok for Syncro Trans?

[1954AfrikaOval]

I was told to take out my Swepco 201 and put in a good 75W-90 gear lube in my 1987 Syncro transaxle. Swepco is too thick for winters in Utah.

Is anyone else running this in theirs?

Any issues?

I understand that it is a GL-5, but I read that others use GL-5 with no issues.

Gear oil is like Religion. I just want to install a good gear lube.

[Syncrozilla]

My advise is to keep the swepco. Is there a particular reason (problem you are having with swepco) you are considering a change?
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Please do not message me on TheSamba. Use my email, [email protected]

[gears]

If you insist on a Mobil 1 product, use the Delvak (HD truck) version, not the FLAPS version gear lube. Delvak is what many Porsche racers use.

Personally, I use Swepco 201, and just endure the first 10 minutes of lousy shifting during winters. I need GL5, as I have a more powerful engine, and Swepco is among the best GL5s.
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aka Pablo, Geary
9.36 @ 146 in '86 Hot & Sticky
'90 Syncro Westy SVX
'87 Syncro GL 2.5
https://guardtransaxle.com

[1954AfrikaOval]

I read on this forum that Swepco is the choice to use. I purchased this Synro with an EJ22 conversion. I changed out the transaxle lube and used Swepco 201. Since then my shifting in second gear has been more difficult. This is the first Utah winter and the trans does not like the cold. Even warmed up it is not shifting as well.

I purchased a decoupler from Daryl AA and he asked what lube I was using. He said to get a good quality 75W-90 and replace the Swepco, it is too thick for my application. I asked if Mobil 1 would do since Mobil 1 0-40 is what I run in all my vehicles engines and they have been solid for many years. He said that would be fine.

Now I have been reading that GL-5 is not good by some, and not to worry by others.

I think I have opened up the "Can of Worms" again.

But I took the advise and 4 quarts of Mobil 1 LS 75W-90 are in the tranny. I drove it about 30 miles and the shifting is back to normal and some of my gear noises are now gone.

I am just after the expertise of this forum to not do damage to my Syncro.
Anyone else running Mobil 1 without issues?

Here is a pic of my tranny magnet when I switched.

[gears]

You can probably thank the GL5 for a relatively clean magnet. The GL4/GL5 debate is misguided, based on VERY outdated arguments.

As you've found, not everyone can live with the balky shifting of dino oils during the winter months. Sometimes a compromise is warranted. But, Delvak would be a better choice for you next time. It may only be available in 5-gallon pails, so search around ahead of time for a 5 liter batch (call a Porsche repair shop).
_________________
aka Pablo, Geary
9.36 @ 146 in '86 Hot & Sticky
'90 Syncro Westy SVX
'87 Syncro GL 2.5
https://guardtransaxle.com

[syncroserge]

[insyncro]

Swepco 201 has been in my winter Syncros transmission and front diff since writing about it years ago.
New England winters are cold, snowy and my vans sees VT, NH and ME in the worst conditions.

Gears has posted some great info about Swepco and Daryl has been advising it for years.
I figure, since it is not easy to get locally, some may be advised to use something else.
That will come at a price, my opinion, and I am not talking about more cost effective fluid.