All, its quite simple anything with HTHS value of less than 3.5 will be detrimental,both my vehicles below

1. 2012 L322 4.4 tdv8
2. Imported japanese spec 2024 Land cruiser Lc300 with 3.3 v6 diesel

both run redline 5w40 euro spec with HTHS of 4.4

anything below 3.5 will be detrimental, all C specs are designed to protect DPF NOT the engine, best out of the lot is C3 wouldnt use anything else.

Will be deleting the DPF on both and will be running redline 5w40 with A3/b3 ultimiate engine protection

Well, yes, we can choose to ignore the legislation and the environment, of course, each to his own.

Neither of the above vehicles are even relevant to this discussion, please read the thread properly in it’s entirety, thank you so much. “If it ain’t broke, don’t fix it” -where’s the fun in that?

I got to wondering did JLR and Ford choose 5W-30 C1 because it was easily obtained OR did 5W-30 C1 become readily available BECAUSE JLR and Ford recommended it.  Geoff

@Geoff:
A bit of both, I think: Motor Mfrs and Oil Suppliers work together to produce low-viscosity oils to enable them to meet economy and environmental targets, sometimes at the expense of longevity of the components, so long as they can squeak through the average warranty length they don’t give a hoot about who gets left with a dead engine bill to pick up thereafter. Those with warranty-induced paranoia of course are hamstrung by the terms “Approved” and “Recommended” into using what may not be the best thing for the vehicle in the longer term, and those same customer types are more likely to go for another new warranted vehicle, disposing of their “can of worms” perhaps unwittingly, into an unsuspecting used market.  “If it ain’t broke, don’t fix it” -where’s the fun in that?

Some more content about problems with oil, and emissions, not just JLR.

 2017 SDV8 4.4 silicon silver AB
2012 TDV8 4.4 Stornaway Grey AB
2011 TDV8 4.4 Buckingham Blue
2012 VW V6 3.0 Tougreg