That is also my concern when using BG synchroshift since it's a similar fluid. How similar is BG to the pennzoil stuff?

 

Not sure I would have to ask them exactly what grade it is? I do think that it is a GL-4 seem like it might be too slippery B/C people are saying that it makes the car shift better.

Our cars are built with more robust square Hyploid gears to handle the high Torque. the gears are not cone shaped like Honda for fast shifting. I have driven Supra TT 6-speed. same feel german GETRAG design. place the car in gear then give it gas. this is AWD! not a speed shifting S2000.

I did not find any specs on B/G web site.

Motul even admits that their gear oil has a GL-5 spec amount of EP sulfer and has not received any complaints when used in GL-4 appliacations. I consider the GL-5 amount to much and the effects will not be known until years later. They have different gear oil blends in europe and I think they have a GL-4 specific over there.

I am going to pick up the GM castrol LT today. It is a european blend. castrol TXT GL-4 equal.

Remember if you have a problem Mitsubishi Will want to know the weight/grade and API rating. If you say Synchromesh you might be screwed.

I think nissan dealers sell the same 75W-85 GL-4 I am going to stop there also.

 

I bought some Diaqueen SAE90 last night from the dealer for my transfer case and rear diff, will be replacing the Redline 75w90 with it. I will still be using the Pennzoil Synchromesh in mine. We have brass synchros in our tranny from what I have read, and the sychromesh is as well." Yellow Metal Friendly"

 

Yes it is yellow metal friendly but the Viscosity is not right. You need the Penzoil synthetic 75W-90 GL-4 Gear oil call the 1 800 number and confirm. the synchromesh is for Honda it is only 5w-30 wt you need 15w-40 wt.

Just trying to help.

I looked for the penn gear oil and can not find it, else I would use it over the GM LT
stuff.

 

I need gear oil?? No...im talking about transmission.. hehe

 

also, many DSMers have been using this for a very long time with no side effects.

 

They should change the name to Penzoil Synchromash! you have a Gear box manual tansmission That requires

75-85W or 75-90W Mitsubishi Diamond Gear Lube, API class GL-4

Does the penzoil meet these specs? Call them and find out.

 

Castrol SMX-S Sold in Europe Fully synthetic 75W85 GL1 – 4 manual transmission fluid providing excellent performance and extended component life

Does anybody know if the Nissan HQ Multi 75W-85 P/N 999MP-MTF00P is the same repackaged? Nissans require GL-4 I picked up 3QT for $10.00 ea. It was dusty seems nissan dealers are using their bulk GL-5 when the shoud be using GL-4.

The GM Syntorq Lt GL-4 (Castrol) was $20.00 a QT! I can get NEO RHD for that.

I will give the Nissan a shot seems to be as close to OEM as I can find.

Does the DiaQueen LSD SAE-90 for the Transfer case say HYPOID on the can. seems there was a picture but that thread got tossed.

You can get the Castrol Syntorq LT 75w-85 GL-4 (Full-Syn) at Standardtransmission.com here in the states.

 

Been using Pennzoil Syncromesh. No problems on the street or track.
Here's specs for BG.

 

It is the equal oil weight of 0W-30 that might be the Issue A 75w-90 gear oil is a 15-40 motor oil.

Notice that is is for use when ATF or a motor oil is required. A 0-30 or ATF is too thin for the EVO. The GM part number that it replaces does not cover GM P/N 12346190 which is Syntorq LT 75W-85 GL-4.

Yes it does cover GL-4 and yellow metal safe. but this seem to be a replacement for the honda MTF and cars that normally use ATF.

The better shifting that you are getting is because there is not enoughf friction for the synchro's to fully mesh and they keep spinning causing more wear on them.

I am no expert and do not claim to be just keep checking. I will be first to admit if I am wrong. no ego here. maybe we can open a big can If worms and help lots of people save their synchro's

Will a expert please jump in on this!

 

Hmmm.. SAE 75W = 0W30 motor oil? SAE 75W seems to be on the thin side. The shop manual calls out for 75W-85 or 75W-90.

 

The 75W is the cold viscosity the 90Wt is what the oil is when it warms up. The Bg stays 75W when warm. Go to bobistheoilguy.com simply too thin. will not protect when warm.

 

This topic has been discussed and debated over numerous times albeit on various boards, including DSMs. Despite the technical data, factory specs, factory recommendations, and the like there are many users with thousands of miles of living proof that syncromesh can be effective at doing it's jobs without adverse affects. It just works. Personally for me i've tried Redline MT90, a mix of MTL/MT90, the factoy tranny oil, and Pennzoil Syncromesh. Syncromesh performed the best by far from my experiences. The decision to keep using Syncromesh was quite simple. Either continue to grind gears using the other lubricants and drastically wear down the gears and syncros or use syncromesh, which seems to work well for many and operates much more smoother.

 

I'm just worried about the long term effects of using thinner oil. I'm worried that the bearings will wear out faster than normal. Surely there has to be an oil of the right viscosity that shifts better than stock. I just ordered some BGII and now I don't think I'll be using it. I guess I'll try some Redline MT-90 since it meets the tranny fluid requirements.

 

Well you don't want to use BGII anyways. Users have reported it doesn't perform much better than the factory oil. It's BGI the non synthetic one that you'd want.
I understand the concerns over the longterm. I considered it aswell. Now I don't even think about it. The shifts are smooth and there's been no indication of anything wrong. Time will tell though....
But I have yet to read of someone with bad experiences using BG or Pennzoil in their Evo gear box.