Gearbox oil 75W 80/90

[Bertcap]

Hi, I am currently driving a 307 manual and my gearbox oil uses shell spirax 75W 80. The manual recommends only esso 75W 80. However, I am thinking of trying other brands like OWS 75W 90? Is this compatible?

 

Thanks

[Heelntoe]

yes

[Teddi]

Manual gear box oils are not as sensitive as Auto.

[Bertcap]

Hi, just one more question... will the use of 75W 90 gives better protection against wear at higher temp?

[Bertcap]

Actually, the reason why I am asking this was because I tried 80W 90 previously and I had difficulties engaging the gear esp. on 1st gear. However, after changing back to 75W 80, the problem went away. Since then, I dare not use 80W90 anymore.

 

Now... because of the positive reviews that I read on OWS gear oil... want to give it a try.

 

Cheers

[Dwoon]

I had used OWS 75W-90 for my front & rear differentials for 2 oil changes at 20K and 50K kms. They are not fantastic.

 

Just changed to redline 75W-90 and there is already a difference. Although I am on auto box, I used to get gear shudder (a loud thunk) before the car is warmed up. Now with the redline oil, this gear shudder is very much reduced to a slight jerk during gear up shift on "cold" running (but no more thunk sound). I always used to think the sound was caused by the auto box..... until now.

 

I presume the 75W-90 oil by Redline makes the diff.... as other oil brands (ATF brand unchanged) remain unchanged. Moreover, the thunk sound was present even when I had fresh OWS 75W-90 put in back then as well as ATF flush.

 

Another note..... the workshop I go to charges me $30/ ltr whereas Redline 75W-90 is also cheaper.

 

Hope this feedback helps. (Although the gear oil used in slightly diff application)

[Bulls_is_back]

For Redline, there is one 75W-90 and 75W-90NS ... which one did you use?

Was reading the redline product literature and was confused about which to use for car without LSD.

 

How much gear oil is needed for one change?

 

thanks

[Dwoon]

I used the normal 75W-90 as I wasn't sure about the LSD thinggy for my car.

 

But what I understand from Terence is that Rex owners will get the NS version for the gear box while using the normal for the rear differentials. Errrmmm... best you check with him as I might have got it the other way round.

 

I only use it for my front and rear differentials. Rear diff used slightly 1 quart while the front diff used like 1.4 quarts. (3 quarts bottles and I have about 0.6 quart left over). Best you also check with Terence on the qty required.

[Furrynadz]

stick to redline mtl 70w80

 

" The synthetic base oils used have a very high viscosity index which provides relatively constant viscosity as temperature changes. MTL is a low 70W at very low temperatures and a high 80W, nearly an 85W, at elevated temperatures, providing adequate viscosity to prevent wear and deaden gear noise."

 

PSA gearboxes quite picky to oil, i try 90wt once b4 also not so smooth, now i using RL MTL 70W80 very smooth, even after 25,000km and runs on NSH, redline is a bit pricey at 23/quart from terence, but i try many others and still prefer this oil, just got 2 bottles again last week

Edited January 2, 2007 by Furrynadz

[Bertcap]

I supposed u r driving a subaru? I don quite understand when you say "for front and rear differentials?" I thought there is only one type of gear box oil??? Pardon me for my ignorance... my 307 is a front wheel drive.

 

So... OWS gear oil is not that fantastic? What about liquimoly 75W 90?

[Bertcap]

Hi Furrynadz, can explain in layman terms? I'm quite lost alreadi... So, I can use 70W 80 as what you have said? Where can I find Terence? Is he also in this forum?

 

Thanks

[Bulls_is_back]

I think he is refering to the manual tranny gear oil and

the front and rear diff gear oil (AWD)

[Furrynadz]

his is AWD, so has a front and a rear

 

terence = trex101 = www. m x t r a d i n g s.com <-- remove spaces

 

 

dont need to bother abt the 70 or 75W rating, just look at the back rating

redline mtl is 80 wt for smoothness yet protects like a 85wt, and its superior oil base ensures that it feels the same from day 1 till the day u drain out

Edited January 2, 2007 by Furrynadz

[Genie47]

What really makes the difference in transmission lubes is the additives and the basestock. Redline is known to load their lubes with loads of additives and their basestock is usually the good stuff. Mind you. Most transmission lubes never experience the high temperatures that engine lube experience so most manufacturers give you poor stuff that just lubes. Gear lubes experience lots of pressure. Not that kind of pressure you will expect from deep sea diving but this pressure is that of it being squeeze out by the gears. Now the oil alone cannot do the job and hence needs the additives. Redline loads their heavy transmission lubes with lots of the stuff.

Edited January 2, 2007 by Genie47

[Furrynadz]

wat u using for gear oil?

[Bertcap]

Thanks... will check out the redline 70W 80.

[Dwoon]

Yup... as Furrynadz mentioned.... mine is an AWD so I have front & rear diff....which uses the same gear oil as what you'd put into your manual gear box.

 

Sorry... have not tried Liquid Moly.... but OWS..... its just not worth the price. I used it in the past due to convenience as its the only gear oil my workshop provides.

Edited January 2, 2007 by Dwoon

[Genie47]

RP 75W90. Almost 90k already. Haven't change out.