parts wanted

Active Member

• Sep 29, 2011

• #1

Some advice discussion needed. I have a 2.5 n/a diesel at 40,000 miles after new rings. I have recently been putting 5/40 oil in it but notice I am using about a pint every 800 miles. Very little smoke except under load, ie. flat out in fourth up steep hills and goes well. Any observations well comed.

 

jamesmartin

Well-Known Member

• Sep 29, 2011

• #2

id use something thicker 15w40 or similar

 

parts wanted

Active Member

• Sep 29, 2011

• #3

do you think it will use less oil if I do? I was wondering if viscosity meant it might be flying out the air intake port. No evidence of ring failure back pressure etc.

 

BOOMER

Bloke from Dorset

• Sep 29, 2011

• #4

Doesn't your motor knock a bit when starting from cold?

Modern engines with much tighter build tolerances use thinner oil, old engines are a bit sloppy and the oil makes up for this

5/40 too thin although it would be ok if it was -15C outside

15/40 would be a better all round grade to use

 

parts wanted

Active Member

• Sep 29, 2011

• #5

Yes it knocks, I sit on idle for about two minutes to get oil around when first started after overnight stand.
The 5.40 thing came about because it was all I could get at the time and now I am noticing this oil use, I thought it might be coming out the breather in rocker cover as no leaks anywhere else, well oil around rocker cover gasket too but that clears when I re tighten the three bolts on top and clear out the breather, but that is getting to be a three weekly thing. I will go back to15/40 and see if that does anything.

 

BOOMER

Bloke from Dorset

• Sep 29, 2011

• #6

parts wanted said:

Yes it knocks, I sit on idle for about two minutes to get oil around when first started after overnight stand.
The 5.40 thing came about because it was all I could get at the time and now I am noticing this oil use, I thought it might be coming out the breather in rocker cover as no leaks anywhere else, well oil around rocker cover gasket too but that clears when I re tighten the three bolts on top and clear out the breather, but that is getting to be a three weekly thing. I will go back to15/40 and see if that does anything.

Click to expand...

If it still knocks after the oil change you may want to look a bit deeper into it, fuel pump timing perhaps....

 

parts wanted

Active Member

• Sep 29, 2011

• #7

Yes, thanks for the advice: oil on weekend and careful monitoring for a bit

 

tacr2man

Well-Known Member

• Sep 29, 2011

• #8

5w oils were brought about to help vehicle manufacturers to meet emission targets , there only other use is in very cold climates . If you look in oil specs for your engine suggested by Landrover it will give you the climate requirement for your engine . 5/40 is not a temperate climate oil for reasons that you are finding , as mentioned 15/40 would be a much better choice . HTSH