roamingyak Posted August 14, 2018 Share Posted August 14, 2018 Could somebody kindly sense check this please - doing a large bulk order so appreciate getting it right 😉 1991 200 TDI 110 - Ashcroft rebuilt transfer box installed in 2008, ratio changed same as a Disco, Stumpy R380, unsure if it has the yellow metals/brass/copper inside, assume it does. Like to bulk order the transfer box oil, Castrol is easy to get delivered, like to put in the best stuff I can. Conscious of the GL5 issue, needs to be GL 4, but does this apply when its fully synthetic also ? So I can't use this Castrol Syntrax Uni Plus 75W-90 as its GL5?https://www.amazon.co.uk/Castrol-Syntrax-Uni-Plus-75W-90/dp/B0082LTKUA/ref=sr_1_2?ie=UTF8&qid=1534249455&sr=8-2&keywords=castrol+75-90 In which case is Syntrans the way to go for example as its only GL 4?https://www.amazon.co.uk/Castrol-Syntrans-Multi-Vehicle-75W90/dp/B0068O6I4E/ref=sr_1_1?ie=UTF8&qid=1534249455&sr=8-1&keywords=castrol+75-90 Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted August 14, 2018 Share Posted August 14, 2018 Castrol has a nifty oil finder, here:Â https://applications.castrol.com/oilselector/en_gb/c/recommendation?vehicleType=cars&manufacturer=land-rover&model=defender-l316-(1990-2016)&modelType=defender-110-2-5-(1990-1995) Â You can find the other oils for your truck in the right hand column. Quote Link to comment Share on other sites More sharing options...
roamingyak Posted August 14, 2018 Author Share Posted August 14, 2018 Thanks, I know, and they list both types under 'Diff front', nothing under transmission - and I doubt they are taking into account the GL5 issue in their 1990-2016 age range 😉 So keen to tap into the wisdom here Quote Link to comment Share on other sites More sharing options...
Arjan Posted August 14, 2018 Share Posted August 14, 2018 Ask Ashcroft ? Â Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted August 14, 2018 Share Posted August 14, 2018 I thought the LT230 could run on anything - I've seen LR manuals spec GL4, GL5, ATF and engine oil for the LT230. Quote Link to comment Share on other sites More sharing options...
tychoS Posted August 14, 2018 Share Posted August 14, 2018 3 hours ago, Arjan said: Ask Ashcroft ?  From the LT230 FAQ at https://www.ashcroft-transmissions.co.uk/frequently-asked-questions/lt230-faq-s.html What oil should I use in my LT230 ? Use a GL4 or GL5, either mineral EP80/90 or synthetic EP75W90  Quote Link to comment Share on other sites More sharing options...
roamingyak Posted August 14, 2018 Author Share Posted August 14, 2018 Thanks all, Went for this as it seemed to remove the GL-5 debate and keen to try synthetic (not sure what has been put in recently - assume its cheapo mechanics oil etc) Syntrans Multivehicle 75W-90 Fully synthetic GL-4 manual gearbox oil (Dave is away on holiday for two week at Ashcroft btw) Quote Link to comment Share on other sites More sharing options...
rick Posted August 17, 2018 Share Posted August 17, 2018 A 75w-90GL5 is fine in LT230, they come from the factory filled with one! Good ones are buffered anyway, their copper corrosion rating is usually 1b meaning minimal to no discolouration in a copper corrosion test. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted August 20, 2018 Share Posted August 20, 2018 Quote Link to comment Share on other sites More sharing options...
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