Thread: engine oil

You could ask Blknight.aus who has been maintaining the RAAF Perenties for some years.

Originally Posted by 87County

Some owners are using Syntrans 75-85 (which is a lightweight long life gear oil) in the gb with good results.

Your statement above is interesting, the Castrol site includes RX Super and GTX diesel as some of the recommendations for the engine and notes that engine oil may be used in the LT95....... so I'm left wondering what you're basing your statement on ? ?

I have spent about 4-5 hours talking to Castrol, Penrite, Gulf Western, Western oil technical departments and Penrite are the only brand that makes an oil that meets the original specs for when the LT95 was made.
The additives that are in modern oils like friction modifiers etc were not in oils in the late 60's early 70's. I have also tried many different types of oil and have found HPR30 works the best.
Diesel oils have high detergent levels, even Castrol tech dept said not a good choice, even though its on their spec sheet! Detergents are detrimental to long synchro life as are friction modifiers!

Hopefully blcknight.aus will let us know what he uses.

I found some history of the LT95 at: Land Rover gearbox history

"This gearbox uses 20/50 engine oil for both the gearbox and transfer case. This is apparently because it has it's own oil pump lubing the gearbox. A common mistake leading to early demise is running 90wt."

My question is this: Does the Perentie 4x4 (with LT95) have its own oil pump lubing the gearbox?

If the answer is yes, then Landrover Daves suggestion would seem pretty solid for both the GB and TC. If the answer is no, then we're probably back to square one.

Yes, the LT95 in the Perenties has the integral oil pump.

Originally Posted by rust

...

My question is this: Does the Perentie 4x4 (with LT95) have its own oil pump lubing the gearbox?
...

Yes. All LT95 gearboxes have an oil pump.

As I have stated in the past, I would not use engine oil in one if I owned one. Modern gear oils such as Syntrans or even VMX80 have better performance.

The LT95 is very strong and will probably have a long life on any oil that is not too viscous, however they are expensive to rebuild and spares will only become harder to find in the future.

I am surprised how much store people put in what oils the military uses. Their descisions are made based on considerations like logistics and commonality, with choosing the optimum oil for the specific application a long way down on the list.

Originally Posted by isuzurover

I am surprised how much store people put in what oils the military uses.

That statement adds another interesting dimension... So with a VMX80 or Syntrans would you also subscribe to Mark2's idea of using a 15/40 in the Transfer Case?

And if so, why would a 15/40 be optimal in a TC situation?

If the oil that came in my FFR's gearbox from auction is what the army use, it's rubbish!

I use RX Super in my fleet of two LT95a/4BD1 One Tens.

Mark,

Your advise seems to be a common thread.
Do you use RX Super in the gear box and TC?
What engine oil do you use?

The reason I ask is I have a Perentie on the way.

Thanks,

Phil.