Advertise on fullfatrr.com »

Home > Maintenance & Mods (L405) > Low SAPS 5W40 synth engine oil
Post Reply  Down to end
Page 9 of 9 <123456789
Print this entire topic · 
kokamagi



Member Since: 31 May 2020
Location: Viljandi
Posts: 86
Estonia 2011 Range Rover Autobiography TDV8 Santorini Black

fisha wrote:
Mohawk, all engines will burn some oil , granted it’s not meant to be loads, but they will burn it. Oil sweeps the cylinder walls and a film always remains after the piston down stroke, which will get burnt in the cylinder. Plus you just have to look at a typical intake of a diesel to see how oily the intake is from egr/, turbo seals etc etc. that still gets drawn into the cylinder as well.


You guys forgot to mention the biggest source of oil getting into the combustion chamber - oil vapors through the PCV system. It also mixes with the soot from the EGR and makes up that sticky sh*t we find in our intakes.
Post #726817 25th Oct 2025 10:46am
View user's profile Send private message View poster's gallery Reply with quote
kokamagi



Member Since: 31 May 2020
Location: Viljandi
Posts: 86
Estonia 2011 Range Rover Autobiography TDV8 Santorini Black

Mohawk wrote:
I'll check DPF regen mileage before & after I swap to see if there is any noticeable difference.


This will show you nothing. What you should monitor, is where does the regen procedure end. If you have the DPF totally clean of ash, then the monitored soot concentration would go to 0 and if there is ash present, the regen will stop somewhere above depending on how much ash there is. Because actually it is not soot mass the ECM is monitoring, but the difference between the pressures before and after the DPF and the soot mass is inferred from this. So if all the soot is burnt away, but there is still noticeable pressure difference present, it is because of something else (most probably the ash) causing it. The DPF regen is stopped when pressure difference doesn't decrease at predefined expected rate albeit all the conditions for regen are met.
For example I've been monitoring my 4.4TDV8 since I bought it 6 years and 60 000 km ago at 200 000 km. Then it stopped regen at around 2.5, now it is getting close to 4. So that's still pretty healthy at around 10-15% of the DPF capacity.

So far I've been using Liqui Moly TopTec 4500 5W30 but I'm also considering experimenting with 5W40 C3 and keeping an eye on the above.
Post #726823 25th Oct 2025 11:29am
View user's profile Send private message View poster's gallery Post Reply
Post Reply  Back to top
Page 9 of 9 <123456789
All times are GMT + 1 Hour

Jump to  
<  Previous Topic | Next Topic >
Posting Rules
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum



Site Copyright © 2006-2025 Futuranet Ltd & Martin Lewis
fullfatrr.com RSS Feed - All Forums


Switch to Mobile site