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rossy

Member Since: 29 Nov 2010
Location: Co. Roscommon
Posts: 1296

2011 Defender 110 Puma 2.4 CSW Stornoway Grey

75/90 in the diffs ?

for the differentials the owners manual recommends 85/90 and many owners use 80/90. I just wondered if it was OK to use an EP 75/90 GL4/5 such as Castrol Syntrax (which also goes in the transfer box). The main reason I'm asking is that the pinion seal has a tendancy to leak and would the slightly thinner semi synth 75/90 tempt fate in this regard ?
Or maybe its best to use a good old fashioned mineral EP80/90? I don't know but its my next job on the truck and I'd appreciate any advice. Thanks

27th Nov 2011 10:45am

MK

Member Since: 28 Aug 2008
Location: Santiago
Posts: 2266

2007 Defender 110 Puma 2.4 SW Chawton White

75w-90 is fine in diffs. Puma 110" SW

.............................................................
Earth first. Other planets later

27th Nov 2011 12:52pm

wslr

Member Since: 18 Jul 2010
Location: Wellington, Somerset
Posts: 581

The Castrol EPX is what should be used in the Defender diffs. The Syntrax Longlife is used in the Defender T-Box, but is also used in the D3/RRS diffs in place of the SAF-X0 that was originally specified.

It's all about additives now.

27th Nov 2011 1:56pm

df1

Member Since: 06 Aug 2011
Location: Ireland
Posts: 221

So would I be mad to just put straight forward EP90 gear oil in Diffs and transfer box ?

27th Nov 2011 2:59pm

MK

Member Since: 28 Aug 2008
Location: Santiago
Posts: 2266

It would not matter as long it is GL-5 (for diffs). GL-4 is good enough for the Tbox. Puma 110" SW

.............................................................
Earth first. Other planets later

27th Nov 2011 4:32pm

df1

Member Since: 06 Aug 2011
Location: Ireland
Posts: 221

Just checked the can, It's Carlube EP90 API GL-5.

So I guess I'm alright with that.

Just on the issue I find ATF gives smoother changes than MTF94 in my R380 box, doesn't seem to be any excess filings or anything at changes (do it every 12k miles), I presume it's not having an adverse effect on the box.

27th Nov 2011 6:21pm

rossy

Member Since: 29 Nov 2010
Location: Co. Roscommon
Posts: 1296

thanks all for the advice. I guess syntrax is OK then which is good as I have rather a lot of it in the shed !

27th Nov 2011 10:59pm

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