[WDE82]

Originally Posted by Itogliano

Right...don't know how I didn't think about viscosity...that's embarrassing lol. Someone else also mentioned it, but I can't see thermal expansion making any meaningful difference. Have to imagine ZF would include the coef. of vol. expansion on the msds if it did

MSDS don't contain such technical data.

[Itogliano]

Originally Posted by WDE82

MSDS don't contain such technical data.

Section 9 is physical and chemical properties. ZF seems to have a much more comprehensive technical info document than a traditional MSDS. For ref, this is what I'm looking at (hopefully linking a PDF works)

https://aftermarket.zf.com/remotemed...luid-8-nzl.pdf

[WDE82]

Originally Posted by Itogliano

Section 9 is physical and chemical properties. ZF seems to have a much more comprehensive technical info document than a traditional MSDS. For ref, this is what I'm looking at (hopefully linking a PDF works)

https://aftermarket.zf.com/remotemed...luid-8-nzl.pdf

Those are all properties that can influence how a material is handled and stored in terms of safety. I guess viscosity makes some sense for slosh since that could destabilize certain handling techniques.

There is probably a technical data sheet out there.L that has some extra things like CTE.

[Polo08816]

Originally Posted by sspade

Viscosity and thermal expansion/contraction are also at play.

Originally Posted by Itogliano

Right...don't know how I didn't think about viscosity...that's embarrassing lol. Someone else also mentioned it, but I can't see thermal expansion making any meaningful difference. Have to imagine ZF would include the coef. of vol. expansion on the msds if it did

I don't think thermal expansion/contraction is significant. It has to be incredibly miniscule. Otherwise, is ZF LG8 turning into a gaseous substance?

[thejeremyman9]

Originally Posted by Polo08816

I don't think thermal expansion/contraction is significant. It has to be incredibly miniscule. Otherwise, is ZF LG8 turning into a gaseous substance?

Shouldnt be, initial boiling point is > 536F.

What i found most interesting in the MSDS is the viscosity changes by almost a factor of 5 between 104F and 212F. Makes me wonder what the optimal trans oil temp is.

[Skowron]

I use ZF oil and no problem with that so far. Static oil change with new pan and filter i used 5l oil so roughly 2 litres was still in gearbox.

[edycol]

Originally Posted by thejeremyman9

Shouldnt be, initial boiling point is > 536F.

What i found most interesting in the MSDS is the viscosity changes by almost a factor of 5 between 104F and 212F. Makes me wonder what the optimal trans oil temp is.

Optimal during operation? 160-170.

[thejeremyman9]

Originally Posted by edycol

Optimal during operation? 160-170.

That's around what i figured, but the car keeps it at about 185F steady state and it can easily go over 200F with a few minutes of spirited driving.

[edycol]

Originally Posted by thejeremyman9

That's around what i figured, but the car keeps it at about 185F steady state and it can easily go over 200F with a few minutes of spirited driving.

185 is fine. The fact that it goes above 200 tells me that ZF8 LG should be only fluid used.

[b7ff]

Hi guys, sorry just got time to update... I did the Transmission and Diff oil change during the weekend.

New Parts/Oil being used:
* ZF Original Oil Pan and drain plug
* 7 Litres of ZF Lifeguard 8 -- We ended using c. 5 litres, while manage to bring out c. 4.5 litres.
* 2 Litres of BMW Hypoid Axle G1 75W-85 Diff Oil
* Drain plug for Diff

Result is great tbh, the car shifts more smoothly.. Takeaways:
* Previously in Comfort "D" mode from D1 to D2, I feel the shift is not that smooth with a "little kick"; but now after the oil change it's all smooth. I am on Stage 2 XHP tune.
* Sport/Sport+ mode to be honest cant feel any change, shift as fast. But I did not push the car too hot/fast.
* Differential oil change -- can't feel anything change as well.

Will I do it again?? Yes I would... You guys should see what the oil like -- and note turns out my car is near 15,000 miles (not 12k), I got the conversion wrong since we use Kilometres here in Indo.

On other note... I also manage to indulge myself with this Spoon Sports Rigid Collar Kit, for the subframe -- hefty price for a very small piece of metal.. Result can be felt definitely in Sport mode (Adaptive Suspension); but the changes is not as drastic as in my Golf GTI.

[edycol]

Color of the fluid is not indicative of remaining additives or high oxidation. Only analysis could determine that.
Toyota WS fluid becomes pitch black after few thousands of miles but it is lubricating millions of transmissions without issues.

[b7ff]

Ahh I see, unfortunately I dont think we have anywhere to send the fluid for analysis in this Country.

Anyway though, Im happy with the trans oil change and would do it again from my experience -- in Comfort mode, its far smoother.. But the Diff Oil, to be honest I dont feel any changes -- not that I have any complaint in the first place.

Off Topic -- this Spoon Sports Rigid Collar impacted the weight of steering as well, it is lighter but firm (previously I felt the steering is a bit heavy). Most of you will feel it in the Sport mode, stationary not moving, steering is very heavy -- interestingly this rigid collar helped. The more I drove the car, the more I feel like the shock absorbers now absorbs bumps and uneven roads much better.