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PsychoHippy

Member Since: 07 Aug 2025
Location: Borne
Posts: 1

Td5 oil pressure on start up

I have a 2005 Defender Td5 with 305.000 km on the clock. It runs perfect, but has developed a scary issue that has been developing over the last 20.000 km and I don't know how to solve.

It started when the oil light suddenly started to stay on longer after cold starts, up to 5 seconds. You can hear a slightly harder "clatter" until the light goes out.
Had it serviced, including new oil and the problem was gone.
After roughly 5.000 km the oil light started to stay on longer and longer, but only on cold start. Warm start, no issues.
Had the oil and to be sure the injector seals changed and problem gone.
After 5.000 km same issue again.
Check the oil consumption regularly, never have to fill up between the service intervals.
This Defender is my daily driver and I am completely lost. Any suggestions or help is much appreciated!

7th Aug 2025 7:48am

4RF RDS

Member Since: 19 Jul 2015
Location: Ottawa
Posts: 987

2000 Defender 110 Td5 XS CSW Epsom Green

I would suspect your oil pressure switch (sensor) might be failing. NUC10003

Good luck 2010 Range Rover MkIII Autobiography Super Charged (Idris)
2003 Range Rover Mk III (Desmond FitzWilliam)
2000 Defender 110 CSW TD5 (CTX)
1992 Range Rover Classic (Lizzy)
1972 Series III 300 Tdi (Stanwood)
1967 MGB GT

Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats.
H. L. Mencken (1880 - 1956)

11th Aug 2025 3:28pm

MadTom

Member Since: 10 Sep 2013
Location: Olomouc
Posts: 676

Are you sure, you have no fuel in oil leak? Thin oil diluted by fuel can make this problems.
If you hear some noise when the oil light is on, you have probably low oil pressure, not broken oil pressure switch. To be sure, you have to remove the pressure switch and measure the oil pressure with a gauge connected instead of this switch.
What oiĺ do you use?
TD5 has oil presurre "regulator" in engine. I have seen one engine with tiny metal particle blocking the regulator, preventing oil pressure to rise to the righ value.
Also TD5 oil pump is "powered" through small chain, and it was common, that the chain wheel get loose on the pump, because of not tight (no loctite from factory) screw holding it (lot of engines died because of it). "Drobek" = The Small One - Discovery 2, "Blufínek" = The Blue Thing - Defender 130, and for me at least Ford Mondeo

12th Aug 2025 6:21am

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