Went with Fuchs Titan Sintopoid FE SAE 75W-85 (GL5) @ £12.95/Litre

 

Open filler plug first .Just to make sure its removable to fill after drained . Because once you have drained off the old oil, and find out you cant refill the trans with new oil , you will be up the creek without a paddle . .

 

ANY 90 weight GL-5 gear oil is fine, except Lucas or Royal Purple, they are junk. Here's an AMSoil corrosion test that shows their weak additive package.

Typical older 75w-90 will sheer down to the 80/85 range, that's why the newer specs allow the thinner gear oils, because the newer formulas will not sheer much. It's mostly a ploy by MB to gain a little mpg, that's about it.

Mobil 1 or Valvoline are as good as it gets. Valvoline driveline fluids are dirt cheap on Amazon, I use their MTF in a few cars.

 

Transfer case is ATF, Dexron 6 is the best speced fluid. Again, Valvoline $4/q on Amazon....power steering, ATF....it's great stuff, better than the MB spec fluids of 15-20 years ago.

 

Apologies - I may have been confusing the terminology (?)

I will be changing the oil in the rear diff - is a transfer case only on 4x4 as they split power between front and rear axles/diffs (?)

 

He's gone right with the Fuchs , approved and highly likely the OEM supplier and Co developer of that oil .

 

After much Goggling etc I've pretty much gone Fuchs across the board on all my major oils/fluids inc ATF/Rear Diff/Coolant as they crop up on MBs approved lists nearly every time.

Whilst I'm new to this DIY servicing game, I like to try and do things properly especially as Im finding myself loving this old Merc more than I thought.

 

The oil industry is very secretive , misterious and not what it seems.

There has been a major manufacturer first fill of Fuchs whilst the oil cap displays.... recommends Castrol and paying an eye watering sum for the privalage .

 

The oil industry is very secretive , misterious and not what it seems.

There has been a major manufacturer first fill of Fuchs whilst the oil cap displays.... recommends Castrol and paying an eye watering sum for the privalage .

Doesn't every manufacturer 'recommend' Castrol or Mobil lol

It's like they stick the name of the highest bidder on the lids? HAHA

 

All about money Sir .


Now for your engine oil.....

 

Ignoring what I said above about Mobil (LMAO)

Mobil Super 3000 XE Engine Oil - 5W-30 Low Ash.

MANN Filters across the board.

 

It's hard to get excited about gear oil.

Fuchs makes a nice MTF GL-4 though. In a manual trans, the fluid will make a big difference.

 

It's hard to get excited about gear oil.

I hear that.

Still nice to get the best stuff/right stuff you can though.