Thread: Another TDV6 Crankshaft Bearing Failure

Again are you referencing to preconceived notions of water boiling at sea level at 100c?

I think you may subconsciously be... (many people do)

No
I am well aware that water in a automotive cooling system is under pressure and increases the boiling point to 120c or so.
Turns out the oil cooler fed direct from radiator outlet at approx 60C coolant temp so why is oil temp at sump so high?

It’s acknowledged that modern engines run hotter than older engines and that 130 degrees is not considered a ‘problem’ with synthetic lubricants. This is why the LR engine doesn’t flag an error at such temps from my experience. This temp would be experienced in extreme climates (Pilbara) and/or towing heavy loads. This should be deemed as ‘arduous’ conditions halving the service interval. Running high oil temps will reduce oil service life leading to premature wear if not changed more frequently.

It’s actually a shame they’re not running adaptive servicing as it could easily tell you based on historical usage when you should change the oils etc.

Originally Posted by shanegtr

Yea engine oil ratings are based at 100degC. The hotter the oil the thinner it will be. I've seen the engine oil temp ony IID tool in the low 120deg range quite often in my D3. Living in the Pilbara I've bumped up my oil to a 5w-40 rather than the 5w30. Will see how it compares through oil analysis

Been running 5w 40 in ours since we got it up to Darwin . Don't do oil sampling but be keen to see how it compares .

cheers Ean

Syn oils don't have the viscosity breakdown above 110°C or so that straight mineral oils used to suffer (and then some suffered it more than others)

If you are seeing oil temps up around 130° consistently it might pay to use an xW-40.
I don't have the computer up atm to run the numbers to compare, but there are enough viscosity calculators online that you can plug some numbers into and compare what a suitable xW-40 oil @ 130° is.
Most xW-30's are around 10-11cSt @ 100°C. xW-40's are generally around 14-14.5cSt@ 100°

FWIW on race engines I used to look for 100-110°C engine oil for maximum power with an xW-30, and pretty much the same when I ran super thin oils with tight bearing clearances. (Lighter than SAE 20)

Bit off topic but not all modern engines run hot. I was in my mates new Triton on the highway (variable valve timing tdi - impressively quiet, although the pitching bouncing ride on bad bitumen is a fair way from his D3) and it runs 89 to 92 on the highway depending on hills etc.

Cheers

Originally Posted by ozscott

Bit off topic but not all modern engines run hot. I was in my mates new Triton on the highway (variable valve timing tdi - impressively quiet, although the pitching bouncing ride on bad bitumen is a fair way from his D3) and it runs 89 to 92 on the highway depending on hills etc.

Cheers

Diesels generally run cooler than petrols.
Never seen the coolant temps on my D4 over 86 degrees on the Gap tool,but I don’t know where the sensor is.