Quote:
Originally Posted by lro11
Try Castrol Syntrans 75W-85, much better performance under high load/heat, but cold shifting will suffer a little.
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Quote:
Originally Posted by lro11
Try Castrol Syntrans 75W-85, much better performance under high load/heat, but cold shifting will suffer a little.
Ummm. I think the OP was referring to auto trans (ZF), in which case Syntrans 75W85 would be a really bad thing to use... :pQuote:
Originally Posted by rick130
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BTW, if you want to go to a synthetic gear oil for an R380 I would highly recommend "Syntrans B" as it was specifically designed to provide good cold shiftability on manual transmissions designed for ATF, whilst delivering improved protection. It was developed in Australia specifically for the T5 manual trans in the BA Falcon XR6 turbos (series 1) - a similar to LT77/R380 sized 'box taking a LOT more torque through it...
http://www.tds.castrol.com.au/pdf%5C...956_200703.pdf
Plus the R380s have an oil pump designed for nice, thin ATF and putting a heavy oil in there will not do it any favours. It has to pump it all through the cooler circuit as well, and gear oils at low temperatures are MUCH thicker than ATFs.
Laycock overdrives (Volvo, MG, etc) would fail the pump if you ran a thick oil, I don't think that this would be much different.
Quote:
Originally Posted by DiscoClax
lr011 mentioned his R380 ;)
I'm well aware of Syntrans B, but IMO Syntrans 75W-85 is far better suited to the R380 in Australia, and Land Rover specify MTF85 which is quite a bit thicker than any ATF @ 100*C (10.5cSt IIRC)
This fluid has been specified since around 1997, and supersedes the previously recommended ATF.
Castrol Australia even recommend Syntrans 75W-85 in heavily worked R380's and have done since around 2000.
Having played a fair bit with various MTF's, most R380's appear to prefer heavier fluids in Oz conditions, (although they can be a little idiosyncratic) particularly when an oil cooler isn't present.
As for the oil pump, it doesn't care what viscosity the fluid is for most practical purposes in most Australian conditions, it's an entirely steel pump unlike the earlier Leyland 'boxes.
Just a FWIW, I'm running Motul Gear 300 in mine and have done for a number of years, check the viscosity ;)
OK, so if you have a T5 maybe go with my recommendations. If you have an LT77 or R380 maybe not so much... :p
My mistake.... I thought the 'Rover 'boxes were designed for ATF, not gear oils.
The T5s weren't really designed for the engine revs we subjected them to in the Falcons, so a thicker oil really baulked the shifts. Hence developing this unique formulation especially for it. Fun fact: the "B" in "Syntrans B" was named after "BTR" who were the local manufacturer of the T5 at the time.
Yep, that Motul is pretty thick, esp when cold (105 cSt @ 40ºC). Typical ATFs are a third of that. Cold shift-ability must be bordering on bloody awful? I hope you don't live near the snow...? :D
Anyway, I'd use either the normal Dex3 in the ZF 4HP22/24 or Castrol Transmax Z / Multivehicle if you want/need a synthetic. Top oil with great characteristics.
Transmax Z is still available at various retailers here.Quote:
Originally Posted by PhilipA
The Product Datasheet is still available online at http://www.castrol.com/liveassets/bp...Transmax_Z.pdf
And it's still listed on the Castrol website: Castrol Australia - Automatic Transmission Fluid
Check the VI and plug some numbers into a viscosity index calculator.Quote:
Originally Posted by DiscoClax
At 0°C Motul Gear 300 is thinner than Syntrans 75w-85 and a few other low viscocity MTF,'s. ;)