Thread: Issues with changing oil types...

i know its terrible isnt it! maybe i'm just paying too much for everything!

Another question if i may from the oil guru's...

I use the 5w30 (now 5w40) in both my td5's the disco is at 160k and the defender is at 130 and catching the disco quickly.

Is there any benefit on an older motor (say with 200k+ on it) to switching to a 10w40 or 10w50 when in a climate like perth? (generally above freezing) or is it recommended to keep within book spec?

Thanks again guys.. you really are a wealth of knowledge!

Steve

Any xW-40 would be fine, I don't see any need to go to an xW-50.

The differences between a 5w and 10w only become apparent below about -10* to -15*C when cranking a cold engine.
A 10W-40, all else being equal may have a slightly better NOACK volatility % than a 5W-40 at elevated temps.

Our Patrol has now passed 360,000km and uses minimal oil with a 10W-40 (use to be a 5W-40 but I'm cheap)

Originally Posted by rick130

No.

IIRC the one JC saw used M1 5W-30.

It could have been a metalurgy issue, but more than likely a lack of EP additives in the lower viscosity M1's, particularly if it was a ILSAC GF-4 spec oil, which is more concerned with drag reduction within the oil and low phosphorous levels to minimise cat contamination.

OW-40 M1 should be fine, it's tailored to Euro engine specs. including light diesels, not US engines.

If you want to run a Mobil syn oil in a Land Rover diesel I'd use Delvac 1, but AFAIK there's nothing wrong with Penrite and the last time I spoke to someone that really knew oils from lots and lots of oil testing in a lot of different engines there's a lot right with it

Rick, my one was serviced on Mobil 1 0-40 while under warranty and ever since this time it has always run Mobil 1 5-50. Do you anticipate that there are any problems with these oils? I read that you thought 0-40 would be fine, but is this the same case with the 5-50? I'm guessing by your comments that they have modified the oils from 0-30 down to make them flow and this has compromised aspects of its lubricity.

Simon, my understanding is that the 0W-40 uses an additive package suited towards Euro engines including their light diesels, the xW-20 and xW-30 types are definitely brewed towards US (and Japanese petrol engine) requirements.

eg,
M1 5W-30 meets ACEA A3/B5
M1 0W-40 meets ACEA A3/B4

The B4 spec must have an HTHS > 3.5 (mPa.s), B5 an HTHS < 3.5.

M1 5W-30 is effectively a fuel economy oil that has specific US GM and US Honda approvals and meets US Ford specs.

M1 0W-40 doesn't thin near as much under heat/load and has specific MB, Opel, VW, BMW and Porsche approvals.

Can't remember where the 5w-50 falls in the scheme of things, but a fuel economy oil it aint

[edit] this spec sheet for 5W-50 looks pretty good with these approvals http://www.mobil.com/Australia-Engli...il1_5W-50.aspx



You can blend an xW-30 oil with much higher HTHS specs and a much more robust additive package, but in the US the oil is used to meet corporate average fuel economy figures for the US EPA and the engines are engineered around these oils and survive for a very long time.
Euro engines are designed and made differently and so require a different oil spec.

We've come to the point that the engineering between oil and engine is so symbiotic that manufacturers have these lists of what's approved and what isn't and you waver from them at your own peril.

Originally Posted by rick130

Simon, my understanding is that the 0W-40 uses an additive package suited towards Euro engines including their light diesels, the xW-20 and xW-30 types are definitely brewed towards US (and Japanese petrol engine) requirements.

eg,
M1 5W-30 meets ACEA A3/B5
M1 0W-40 meets ACEA A3/B4

The B4 spec must have an HTHS > 3.5 (mPa.s), B5 an HTHS < 3.5.

M1 5W-30 is effectively a fuel economy oil that has specific US GM and US Honda approvals and meets US Ford specs.

M1 0W-40 doesn't thin near as much under heat/load and has specific MB, Opel, VW, BMW and Porsche approvals.

Can't remember where the 5w-50 falls in the scheme of things, but a fuel economy oil it aint

[edit] this spec sheet for 5W-50 looks pretty good with these approvals Mobil 1 5W-50



You can blend an xW-30 oil with much higher HTHS specs and a much more robust additive package, but in the US the oil is used to meet corporate average fuel economy figures for the US EPA and the engines are engineered around these oils and survive for a very long time.
Euro engines are designed and made differently and so require a different oil spec.

We've come to the point that the engineering between oil and engine is so symbiotic that manufacturers have these lists of what's approved and what isn't and you waver from them at your own peril.

Hi Rick, thanks so much for this. Admittedly I had to google a bit to understand what the ratings actually defined etc.

Mobil 1 5-50 came up as A3/B3 & A3/B4 which is the same as what they have classified the 0-40 with. Hopefully it should be good?????

OK, Penrite Diesel 5-40 you say. Time to change ofter so many good years.

Originally Posted by rick130

Geez Steve, that's a hard one and a problem I wish I had

I'm actually running Penrite Diesel SP (full syn, 10W-40) in the Tdi and Patrol these days as I get it a lot cheaper than Delvac 1.

Delvac expensive????.
Last 20L drum of Delvac E7/E6 I got from a WA member was less than $140.
Andrew