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Evening.

I know it's come up before but am I right in thinking EP gear oil is now not a good idea for boxes ? After a quick search I've come up with this.

 

What do the experts think ?

 

Cheers Mark

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Hi John,

good response. People put stuff in places because people put stuff in places.

 

Is the gearbox an EP bit of kit - no.

They have gears that are happy to mesh and to a degree roll over each other. There is a degree of scuffing.

The Diff is a serious EP location. The hypoid gear lacks this rolling effect.

Many EP oils are GL5 - not good for the box. GL4 is good.

 

Oil manufacturers spend a fortune on gearbox oils - there may be a clue in this.

OK if you need a thicker oil (why?) then use a thicker gearbox oil.

 

Originally the overdrive had warnings about using EP oil. This changed years later by TRiumph - probably to reduce leaks.

 

 

Roger

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Roger, would that go some way to expalining a 'sluggish' O/d engagement when cold, improving as oil warms up?

Sticky EP oil behaving like grease when cold?

 

looks like another Penrite sale......

 

(which is a bu**er, as I was in Moss this afternoon, but without 'gearbox oil' in my head!)

 

Mind you, that particular shortfall may also be the cause of so many 'other issues'........

:D

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