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Gearbox and overdrive oil


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#1 StuartG

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Posted 13 August 2018 - 07:38 AM

Hi All
How often should gearbox and overdrive oil be changed and which is the best oil for this ?
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#2 astontr6

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Posted 13 August 2018 - 08:06 AM

Hi All
How often should gearbox and overdrive oil be changed and which is the best oil for this ?

I used EP80/90 GL4 type for 44 years before a rebuild when the lay shaft bearings started to wear through the hardness layer on the layshaft. The usual fault with the TR gearbox! I have continued to use this type of oil. Some of our Group used 20/50 engine oil only to find that it produced a white froth which blocked up the oil ways in the O/D. then required a full strip down and ended up with very red faces as they had always decried the use of hypoid oil which BL recommended! So the choice is yours? Note : Even the gearbox guru is now not certain about the use of engine oil?

 

Bruce.


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#3 Mike C

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Posted 13 August 2018 - 08:40 AM

I've always used Redline MT 90 which is a synthetic SAE 75-90 , GL4 oil.

 

I don't use GL5  oil due to the horror stories about it and brass/bronze components that were around  20 or so years ago. I do use GL5 for the diff due to the sliding forces on the hypoid gears.


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#4 Tim D.

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Posted 13 August 2018 - 09:01 AM

Mike,
Have used MT40 in other gearboxes. Did you compare with standard EP? Does it improve the 3-2nd gear change?
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Lover of old cars and old cars racing


#5 Mike C

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Posted 13 August 2018 - 10:25 AM

One of the reasons I used the MT-90 was to stop the baulking when selecting 2nd gear that occurred when using GL4 mineral oils- this was greatly improved.

 

I was tempted to try non detergent SAE 30 engine oil to stop  this baulking but it seemed a step too far.


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#6 SeanF

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Posted 13 August 2018 - 11:34 AM

Bill from Hardy Engineering recommended using EP90 GL4 when they rebuilt my GB and OD a month or so ago.


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Many thanks.
 
Sean

#7 StuartG

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Posted 13 August 2018 - 02:35 PM

Thanks for the replies chaps, what are your thoughts on frequency of oil changes in gearbox and overdrive ?
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#8 Mike C

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Posted 13 August 2018 - 11:17 PM

Depends on the mileage and weather the car is stored outside in frosty climes (condensation  in gearbox).

 

My car's a low annual mileage , stored in a garage vehicle. I do an annual level check and a change about once every five years. If you have an A type overdrive check the filter and magnetic plug -it's amazing what that plug picks up. 


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#9 StuartG

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Posted 14 August 2018 - 05:04 PM

Thanks Mike
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#10 YankeeTR5

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Posted 14 August 2018 - 05:15 PM

I used 30 wt non detergent oil in my j-type overdrive that was working fine-supposedly a recent rebuild when car was purchased.   I have now pulled it and am having to do a rebuild due to the layshaft bearings and thrust washers disintegrating quickly.    I will not use 30wt ND oil, nor any non factory recommended lubricant again.  Irrespective of what the various forums suggest!  YMMV


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#11 Nigel Triumph

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Posted 14 August 2018 - 09:05 PM

Halfords 80/90 GL4 in my TR6 and GT6. Both have O/D boxes which have done thousands of miles without problem.

Nigel
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#12 Bill Bourne

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Posted Yesterday, 9:06

Castrol ST90  - Castrol Classic Oils - Give them a call, I've them very helpful and a they provide a good delivery service.

 

https://www.castrol....assic-oils.html

 

Best Bill


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