Oil for T5 and BTR?... what's the thoughts these days?

[TVR Beaver]

Whilst I have the car in the air I may as well change the oil in the diff and gearbox... may be done about 10K but it's not expensive.
I tried to get hold of John at readmans to see what he suggested, but he's not about?

It's ATF for the box... any type recomended?.... have seen some people using gear oil now.. not sure if thats a good thing??

And the diff... looking at the leftover bottle i have, looks like I'v got Castrol SAF-XJ 75w-140 in there now.. but I have two bottles of Castrol Syntrax LSD 75w-140 on the shelf... can't remember why I didn't use it? both API GL5 Synthetic?.... any suggestions here also?...

Cheers...

[TVR Beaver]

Cheers Frank.. thanks for that.. but I thought the BTR and T5 used diffo stuff to the LT and GKN?.. the BTR has to be LSD oil (which this is)... but does JR say Millers is best or somthing? what ever it is posted on here, I think its hard to get?... will have a search later maybe... trying to get the fill plug out first at least I'm doing it this way around and not the drain plug first like someone I know

[TVR Beaver]

Very true, and it depends why someone says something is preferred... and what actual testing has been done?.. I’m no oil expert although Millers is just down the road from me so plenty there....

But it’s more driven by being lazy these days...and not wanting to do any repairs... If I can make it last longer by spending a bit of £, then it makes sense to me....

Anyway, will get the plugs out first... If I can’t do that, then talking what to put in becomes pointless

[TVR Beaver]

Great... Thanks for that all...
Is there only 1 grade of that ATF.. Looks like there is MAX... 1320 and 12320? Will try track it down...

Edited by TVR Beaver on Saturday 7th January 18:05

Edited by TVR Beaver on Saturday 7th January 18:08

[TVR Beaver]

Order some Royal Purple Max ATF... should do the job... will use the Castrol I have for the diff.... cheers ...

[TVR Beaver]

I've bought Royal Purple ATF but have been reading the thread on the Chim forum... they are talking about running in new boxes on mineral ATF... but Chimpongas does say using fully synthetic ATF even in a fully run in box may be too slippy for the syncro's and will make 5th crunch if rushed?....
anyone had this at all?
The RP Max ATF is a full synth?....