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BCdefender

Member Since: 26 Oct 2015
Location: Nanaimo
Posts: 211

15W40 oil okay for the TD5?

Just did an oil and filter change with 15W/40. The manual says 5W/40 and doesn't mention the 15W.

Is there a potential problem in using 15W/40 in the TD5?

Thanks 1999 Defender 110
2003 P38
2007 RR SC

"And that's why it needs to be celebrated, because when the Defender goes we'll have lost this pointer to where we came from, and we're really going to miss it."

My build thread: http://www.defender2.net/forum/topic47750.html

21st Jan 2017 5:23am

Vogler

Member Since: 02 Nov 2014
Location: Brussels
Posts: 309

The first digit (in this case 15 or 5) denotes the viscosity of the oil at low temperatures: the lower the number, the more fluid the oil is when cold. If your profile is correct you are living in a beautiful yet very cold part of the world. Maybe other people can tell you otherwise out of experience, but I wouldn't feel at ease with 15W...

Greetings,

Joris

21st Jan 2017 9:15am

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4788

Yeah 15w40 will be too viscous when cold so won't lubricate the engine properly on cold starting. Stick with the recommended 5w30

2002 90 Td5 Station Wagon
1990 Vogue SE
Triumph Tiger Explorer 1200
Td5 90 Thread http://www.defender2.net/forum/topic50767.html
Tdi 110 Thread https://www.defender2.net/forum/topic69562.html
RRC Thread http://www.defender2.net/forum/topic54492.html
Instagram http://www.instagram.com/george_grafton

Last edited by grafty99 on 21st Jan 2017 10:48am. Edited 1 time in total

21st Jan 2017 9:49am

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4788

Fully synthetic too

21st Jan 2017 9:51am

miker

Member Since: 13 Sep 2015
Location: Surrey
Posts: 1767

I'd say not, too thick when cold.

Also would personally buy more specific td5/of engine oils.

21st Jan 2017 10:47am

lightning

Member Since: 23 Apr 2009
Location: High Peak, Derbyshire
Posts: 2882

It won't harm the engine but will use a little more fuel.
You will only get actual lubrication issues at temperatures below about -20 deg C

21st Jan 2017 11:00am

Raywin

Member Since: 27 Feb 2015
Location: North Yorkshire
Posts: 48

I like to use 5w 40 in mine, I find that the engine is a bit quieter than when I use 5w 30 probably starting to get a bit more clearance in the journals now. Ray

21st Jan 2017 11:02am

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4788

lightning wrote:
It won't harm the engine but will use a little more fuel.
You will only get actual lubrication issues at temperatures below about -20 deg C

If his avatar is right he lives in Canada so -20c is highly likely! 2002 90 Td5 Station Wagon
1990 Vogue SE
Triumph Tiger Explorer 1200
Td5 90 Thread http://www.defender2.net/forum/topic50767.html
Tdi 110 Thread https://www.defender2.net/forum/topic69562.html
RRC Thread http://www.defender2.net/forum/topic54492.html
Instagram http://www.instagram.com/george_grafton

21st Jan 2017 11:28am

4RF RDS

Member Since: 19 Jul 2015
Location: Ottawa
Posts: 945

2000 Defender 110 Td5 XS CSW Epsom Green

I'd be concerned with the 15W when it gets to zero or near zero. Stick wth the 5W and fully synth. Winter in Nanaimo is a lot milder than here in the Ottawa Valley but be wary of low temps when you use 15W oil. Cheers 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)

21st Jan 2017 12:56pm

lightning

Member Since: 23 Apr 2009
Location: High Peak, Derbyshire
Posts: 2882

Well yes, in Canada l'd be looking at 5w/30 or 5w/40 for the reasons stated above.

I did not notice l thought he was in the UK!

21st Jan 2017 1:25pm

BCdefender

Member Since: 26 Oct 2015
Location: Nanaimo
Posts: 211

On Vancouver Island it rarely gets below zero at sea level but obviously once you head into the mountains the temperature quickly drops. Regardless it sounds like 5W 30/40 synthetic is the consensus. Thanks again.

1999 Defender 110
2003 P38
2007 RR SC

"And that's why it needs to be celebrated, because when the Defender goes we'll have lost this pointer to where we came from, and we're really going to miss it."

My build thread: http://www.defender2.net/forum/topic47750.html

21st Jan 2017 3:37pm

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