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StuartG

Gearbox and overdrive oil

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

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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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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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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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