Petrol engine 4.2 SC:

In the past week, for the first time, I've noticed black soot type deposits on the chrome tailpipe lips. Just like is common on diesel exhaust tips. Never seen this on our SC tips before. So, just read our service invoice from the main dealer last week which states they used "Castrol Low Soot Oil 5W/30".

I thought low soot oil was for diesel engine vehicles?

don't know Ryan, but it could be possible its linked to the BG de gunking the engine. There is nothing that can't be fixed with a hammer😜😜
FFRR 4.4 SDV8 Autobiography Santorini Black.
KIA E-Niro 4+
2021 Discovery 5 D300 MHEV commercial

Mark could be correct and you're flushing out all the crud.. ... - .- -.




Y. O. L. O.
.

Thought exactly that a day or so ago chaps re the 'flush' effect.

Then today received the overdue service invoice via email and saw reference to them having input 'low soot oil' which my initial internet search engines all direct towards being used in DPF/ Diesel engines! Hence my want for someone in the know to say "Calm doon oh paranoid one, it's like garlic bread... It's the future!"

don't think you need to panic too much as the oil specs for the 4.2 and TDV8 are exactly the same, WSS-M2C913-B Ford spec. Not sure about the low soot aspect, but they should be using an oil which complies with this. worth an ask which oil they actually put in though I'm pretty sure they must have gone far off piste if they have put the wrong stuff in.

Castrols recommended oil on their oil finder is Magnatec 5w30 A1 There is nothing that can't be fixed with a hammer😜😜
FFRR 4.4 SDV8 Autobiography Santorini Black.
KIA E-Niro 4+
2021 Discovery 5 D300 MHEV commercial

I rang the servicing MD parts dept this morning, asked what type of engine oil they use on the 4.2SC, the person didn't know off the top of his head, asked someone, said he thought it was 5/30 and when I asked about low soot oil being only for diesels, he said it can be used in both.

As long as it's the correct grade, and meets required specs, you can use normal oil or low ash oil

Cheers Mikey, is there one 'better' than the other do you know (never heard of it used on petrol before and I know you can buy both types, hence the question)?

Generally, the low ash oil is fully synthetic, and a better quality of oil

But I am no expert on engine oil

Just had my vehicle serviced etc and I notice that the oil spec was WSS-M2C934-B.

That is the updated spec. Is that on the 3.6? What does it say in the handbook. There is nothing that can't be fixed with a hammer😜😜
FFRR 4.4 SDV8 Autobiography Santorini Black.
KIA E-Niro 4+
2021 Discovery 5 D300 MHEV commercial

I'd be worried if any oil was causing soot deposits on the exhaust, let along a low soot oil!  .
Experience is the only genuine knowledge, but as time passes, I have forgotten more than I can remember
Volvo V70 P2 2006 2.4 Petrol 170bhp Estate SE
MG Midget Mk1 1962

Previous: L322 Range Rover TDV8 3.6 2008; L322 Range Rover TD6 3.0 2002; P38A Range Rover V8 1999

One question. Why should it be related to the oil used? I would have thought that unburned fuel is more likely to cause soot deposits? John
2008 Stornoway Grey 3.6 Tdv8 Vogue
2005 TD6 Java Black Vogue - Written off!!
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2003 Discovery TD5 Auto, Nanocom Evolution - gone to a new home!
MasseyFerguson 152 - No electronics!! - Sold

I've spent the best part of 3 hours with a very good professional mechanic giving the SC the once over this afternoon in his immaculate workshop and he too said 5W/30 low soot oil is fully synthetic, petrol engine compatible; and his knowledge was much more convincing than the LR Parts Dept person I spoke with this morning.

northernmonkeyjones wrote:

That is the updated spec. Is that on the 3.6? What does it say in the handbook.