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RichLech

Member Since: 09 Nov 2015
Location: West Sussex
Posts: 115

2012 Defender 90 Puma 2.2 HT Keswick Green

I'm using the Castrol Syntrans Multivehicle 75W-90 GL-4 synthetic in the gearbox but for transfer box & diffs, which can take GL-5, I am using Castrol Syntrax Universal Plus 75W-90 GL-5 synthetic.

Not sure what the difference is between GL-4 and GL-5. I'm just following advice found in the forum and from Opie Oils.

Opie Oils have several engine oils to the Ford M2C934-B (low SAPS) specification. I am using Millers XF Longlife C1 5W-30 Synthetic.

I bought it all from Opie Oils,

5th Apr 2016 7:34am

discomog

Member Since: 09 May 2015
Location: Notts/Lincs Border
Posts: 2530

2015 Defender 90 Puma 2.2 XS CSW Santorini Black

My understanding of the difference between GL4 and GL5 transmission oils is the amount of protection it provides to the yellow metal content of the transmission, ie synchromesh hubs etc. GL4 is a low detergent oil and therefore gives better yellow metal and phosphorous element protection than GL5.

Best to stick to the exact oil spec given by the motor manufacturer particularly if your vehicle is still under warranty. Defender 90XS SW
Mini Countryman Cooper S
Morgan Plus 8

5th Apr 2016 9:02am

muddybaldboy

Member Since: 09 Apr 2012
Location: Ruthin
Posts: 395

After upgrading my TD5 oils at your recommendation, I'm looking for possible (if any advantage) alternatives for Old's Cool, my early 90.

Land Rover 90
1984 68000 miles from new
2.25 petrol
Light use, sub 2k miles per year, usually dry stored over winter.

Suggestions? He who dies with the most toys...wins!

21st May 2016 10:27pm

boxoftricks

Member Since: 06 Feb 2019
Location: Home Counties
Posts: 747

2011 Defender 110 Puma 2.4 USW Zermatt Silver

Defender 110
TDCI 2.4 2010
No modifications
100,000 miles
Australian import
Been serviced (apparently) ever 6000k

Please advise on all oil you recommend as I’d like to change everything.

Thanks

10th Mar 2019 9:26am

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