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Old 12th January 2007, 13:22   #1
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Default Delvac 1 or Delvac MX

Dear Gurus

My Accent CRDI has done 10,000 KM. What engine oil would you recommend?

1) Delvac 1 -Synthetic high performance diesel engine oil exceeds the requirements of API Service CH-4, CG-4, CF-4, CF, SJ, SH
2) Delvac MX -Multigraded commercial vehicle engine oil exceeds the requirements of API CI-4/CH-4/CG-4/CF-4/CF/SL/SJ

After reading the below article, I think MX is superior to Delvac 1. But, MX is Multigrade and the other is Synthetic. So please help me decide.

Mobil Delvac MX

Mobil Delvac MX is Mobil’s premium mineral diesel engine
oil. It has been reformulated to meet the requirements of the
American petroleum Institutes CI-4 specification. But what
does this mean and how will it affect your fleet? The
following list of questions and answers will help to give you
this information.

Why is Mobil Delvac MX 15W-40 being reformulated?

The American Petroleum Institute (API) defined a new oil
service category, API CI-4, to ensure diesel engine oils would
provide the lubrication requirements for new lower emission
diesel engine designs which require oils to handle higher
temperatures, acids, soot levels, and wear protection. Mobil
Delvac MX 15W-40 was reformulated to take advantage of
the opportunity to provide enhanced oxidation resistance,
soot handling, and wear control in these newer engine
designs, and benefit older hard working diesel and gasoline
engines as well.

What are the performance requirements of API CI-4 over
the previous quality level, API CH-4?

API CI-4 includes some tougher, more complicated and
higher cost tests than API CH-4 and delivers a significant
performance enhancement versus earlier specifications. Key
areas of improvement are wear control, soot handling, seal
compatibility, viscometric control and oxidative stability.
Below is the user language defined for API CI-4:
API Service Category CI-4 describes oils for use in highspeed,
four-stroke cycle diesel engines designed to meet US
2004 exhaust emission standards implemented in 2002.
These oils are intended for use with diesel fuels ranging in
sulphur content up to 0.5% weight.
These oils are specifically formulated to sustain engine
durability where Exhaust Gas Recirculation (EGR) is used,
and the impact of these oils on other supplemental exhaust
emission devices has not been determined. Optimum
protection is provided against corrosive and soot-related
wear tendencies, piston deposits, degradation of low and
high-temperature viscometric properties due to soot
accumulation, oxidative thickening, loss of oil consumption
control, foaming, degradation of seal materials, and viscosity
loss due to shear.
Engine oils that meet the API Service Category CI-4
designation have been tested in accordance with the ACC
Code and may use the API Base Oil Interchangeability
Guidelines and the API Guidelines for SAE Viscosity-Grade
Engine Testing.
API CI-4 oils are superior in performance to those meeting
API CH-4, CG-4 and CF-4 and may be used in engines calling
for those API service categories.”

In what ways does Mobil Delvac MX 15W-40 exceed API
CI-4 performance?

It takes a very strong oil to exceed the requirements of API
CI-4. Mobil Delvac MX 15W-40 does just that with a
combination of advanced additive and base stock technology.


The oil in new engines is tending to increase in temperature
so the tough new Sequence IIIF engine test was included to
establish strong performance for API CI-4 oils. New Mobil
Delvac MX 15W-40 has demonstrated performance
significantly stronger than required by API CI-4.


The soot generated in diesel engines is increasing. Soot not
only makes engines dirty and can increase wear, but it can
also result in significant increased oil viscosity, reducing the
life that oil can effectively lubricate the engine. New Mobil
Delvac MX 15W-40 has enhanced soot dispersancy in excess
of API CI-4 requirements. In addition, it offers superior
engine cleanliness demonstrated in laboratory testing to
exceed that required by API CH-4 and API CI-4 in low and
high sulphur fuels.


Increased temperatures, soot, and other hardware design
changes with newer engines are stressing the need for high
performance wear protection. New Mobil Delvac MX 15W-40
embraces that harsher environment providing improved
bearing corrosion protection and reduces general engine wear
beyond what is required in tough new engines tests.

Is the API CI-4 quality Mobil Delvac MX 15W-40
compatible with the product I currently use today? Are
there any handling guidelines I need to be aware of prior
to receiving the new product?

The new formulation is compatible with the current Mobil
Delvac MX 15W-40 formulation and with all standard engine oil
formulations. It is not necessary to change your engine oil
prematurely to begin using the new formulation and “top-up”
should continue to be done according to normal practice. If
you receive product in bulk, you’ll want to minimise the old
formulation before taking delivery of the reformulation.

I don’t have any newer, low emission engines. Can I use
Mobil Delvac MX 15W-40 in my equipment?

Absolutely! The new API CI-4 category is backward
compatible and Mobil Delvac MX 15W-40 meets or exceeds all
previous active API categories, including CH-4/CG-4/CF-4/CF.
The added performance you get with the superior API CI-4
technology in Mobil Delvac MX 15W-40 provides the benefit of
extended engine life reducing maintenance costs in new and
old equipment alike. In addition, you can have the added
protection of strong passing performance for Mobil Delvac MX
15W-40 in the seal compatibility test in API CI-4, a test that is
not included in earlier API C categories. Please note the most
benefit is obtained from using this product throughout the life
of your equipment.

What impact does this have on off-highway equipment?

Off-highway engines will benefit from Mobil Delvac MX 15W-
40’s higher performance just as on-highway engines do.

Can I use the new formulation with high sulphur fuels?

Yes. The new formulation helps extend engine life where high
sulphur fuels are used as well. Please check OEM
recommendations for oil drain interval change in markets
where fuel sulphur level is >0.5% wt.

Will Mobil Delvac MX 15W-40 have any new claims?

Mobil Delvac MX 15W-40 meets or exceeds industry
specifications including: API CI-4/CH-4/CG-4/CF-4/CF/SL/SJ as
well as ACEA E5/E3/B4/B3/A2 and is recommended for
equipment builder specifications including: DaimlerChrysler
MB 228.3/229.1, MAN 3275, Renault RVI RLD, Mack EO-M
Plus, Cummins CES 20078/77/76/72/71, Volvo VDS-3/VDS-2,
Detroit Diesel 7SE 270, MTU Type 1 and Allison C-4. Please
refer to the Mobil Delvac MX 15W-40 data sheet for the latest
claims and specifications.

Can I use this product in gasoline engines as well?

Yes. Mobil Delvac MX 15W-40 meets or exceeds the latest API
Service Category for gasoline engines, SL, and also API SJ,
ACEA A2 and MB 229.1. There are no compatibility issues.

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Old 11th June 2011, 23:15   #2
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Default Re: Delvac 1 or Delvac MX

@admin - I apologise for bringing out an old thread, but the question raised here is something I have in mind as well.

Between the two, which would be better for Manza?
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Old 12th April 2015, 12:22   #3
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Default Re: Delvac 1 or Delvac MX

This has been bugging me too. I've a VW Jetta 2.0 TDI and confused between the two. Delvac MX is readily available in 15W40 as well. VW recommended 5W40's lower viscosity bound is an overkill for Punjab's Climate.
But the actual question: Delvac 1 or Delvac MX?
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