Gas engine oil in Australia: which Nateria grade for your engine?

Choose a gas engine oil by your engine maker’s oil list first, then by fuel gas and the ash level the engine asks for. Of the TotalEnergies Nateria grades Bulk Lubricants Australia supplies, four are low ash for natural gas engines (Nateria MH 40, MP 40, MX 40 and MWX 40, 0.45 to 0.54 % sulphated ash), and Nateria MJ 40 is medium ash (0.82 %) for biogas, dual fuel and low halogen landfill gas engines.

Published 27 October 2026. Figures are from the TotalEnergies data sheets and OEM status from the TotalEnergies Australia online catalogue, both listed under Sources.

Which Nateria grade is approved for my engine?

Find your engine maker in the left column. Each cell shows the status exactly as TotalEnergies words it; where the catalogue and the data sheet differ, we show the weaker one.

Engine maker	Nateria MH 40	Nateria MP 40	Nateria MX 40	Nateria MWX 40	Nateria MJ 40
Caterpillar Energy Solutions / MWM (CG132, CG170, CG260; TCG gas engines)	Approved^{[6, 1]}	Approved^{[7, 2]}	ApprovedCG132B and CG170B also listed^{[8, 3]}	Not listed	Approvedfor medium ash requirements^{[10, 5]}
MTU / Rolls-Royce Series 4000 gas engines	Confirm in manualcatalogue approves L62FB; data sheet lists natural gas variants^{[6, 1]}	Approvednatural gas L32/33, L61-L64; biogas L32FB/L62FB^{[7, 2]}	Not listed	Not listed	Approvedbiogas L32FB/L62FB; 400BR biogas^{[10, 5]}
MAN Energy Solutions gas engines	Confirm in manualdata sheet lists M3271-2; not on the catalogue list^[1]	ApprovedM3271-2 natural gas; M3271-4 special gas^{[7, 2]}	Not listed	Approved35/44G TS, 51/60, gas engines^[9]	ApprovedM3271-4 special gas^{[10, 5]}
Wärtsilä gas and dual-fuel engines	Confirm in manualdata sheet lists W25SG, W28SG, W180SG, W220SG^[1]	Meetstechnical requirements^[2]	MeetsSG and DF types listed^{[8, 3]}	ApprovedSG and DF types listed^{[9, 4]}	Confirm in manualcatalogue: Approved ‘Wärtsilä’ with no engine type; Meets CR26V1DF^[10]
INNIO Waukesha	Meetstechnical requirements^{[1, 6]}	Meetstechnical requirements^{[2, 7]}	Confirm in manualdata sheet lists VGF, VHP, 275GL/GL+, APG (non co-gen)^[3]	MeetsVGF, VHP, 275GL/GL+, APG (non co-gen); 220 GL^{[9, 4]}	Not listed
INNIO Jenbacher (TA 1000-1109)	Meets^[6]	Meets^[7]	Meets^[8]	Meets^[9]	Meetsgas type B^{[10, 5]}
Bergen Engines	Not listed	ApprovedK-G1 to K-G4, BV-G^[2]	Confirm in manualdata sheet lists B35:40, B36:45, C26:33, K-type^[3]	ApprovedB35:40, B36:45, C26:33, K-type^{[9, 4]}	Not listed
Caterpillar 3300-3500 series	Meets'technical requirements from Caterpillar'; no model named^[1]	Meets'technical requirements from Caterpillar'; no model named^[2]	Confirm in manualdata sheet lists Caterpillar 3300-3500 series^[3]	Confirm in manualdata sheet lists Caterpillar 3500 series^[4]	Not listed

Approved:: The TotalEnergies Australia catalogue lists the engine maker under “Approved”, or the data sheet says the homologation has been granted, and neither source words it more weakly.
Meets:: TotalEnergies says the oil meets the maker’s requirement. That is TotalEnergies’ statement, not an approval from the engine maker.
Confirm in manual:: The engine appears on a data sheet without approval wording, or the two TotalEnergies sources differ. Check your engine manual or service provider before you fill.
Not listed:: Neither source names this engine maker for this grade.

Jenbacher gas types (A or B) and engine types by grade are in our Jenbacher gas engine oil guide. The data sheets also name other makers (for example Deutz, TEDOM, Agrogen and Daihatsu); check the sheet for your engine.

Top takeaways

The engine maker’s list decides. Each Nateria grade carries a different set of OEM approvals; the panel below shows which, and how strongly TotalEnergies words each one [1-10].
Fuel gas comes next. TotalEnergies positions the low ash grades for natural gas and Nateria MJ 40 for biogas, dual fuel and low halogen landfill gas [1-5].
Ash and TBN are the numbers to compare. Sulphated ash runs from 0.45 % (MH 40) to 0.82 % (MJ 40); TBN from 4.6 (MP 40) to 8.8 (MJ 40) mg KOH/g [1-5].
Gas engine oil needs cooler storage than most oils. All five data sheets say store away from humidity at temperatures not exceeding 35 °C, with a 3-year shelf life for unopened drums [1-5].
Test the oil, don’t guess the drain. Every Nateria data sheet recommends TotalEnergies’ ANAC GAS oil monitoring program [1-5].

How do the Nateria grades compare?

All five are SAE 40. They differ in ash, alkalinity (TBN) and the engines they are built for. Typical values from each TotalEnergies data sheet:

Grade	Type	Best for	Sulphated ash, % wt	TBN, mg KOH/g	Viscosity 100 °C, mm²/s	Viscosity 40 °C, mm²/s	VI
Nateria MH 40^[1]	Low ash (< 0.5 %) detergent mineral oil	Natural gas engines needing a low ash oil, in power generation with or without cogeneration	0.45	5.5	14.8	142.2	105
Nateria MP 40^[2]	Premium low ash, hydrocracked base oils	Four-cycle natural gas engines in hard conditions: fast engines, high temperatures, small sumps	0.48	4.6	13.8	122.5	110
Nateria MX 40^[3]	Low ash, high TBN, semi-synthetic	Latest steel piston engines with BMEP over 22 bar; multi-OEM fleets and cogeneration	0.51	7.2	13.9	122.5	111
Nateria MWX 40^[4]	Next generation premium low ash, high TBN	High-output steel piston engines from 10 to 20 MW	0.54	7.3	14	118.3	111
Nateria MJ 40^[5]	Medium ash (< 1 %) detergent mineral oil	Dual fuel engines, biogas engines and low halogen landfill gas engines	0.82	8.8	15.1	148	104

Typical values, not specifications. Test methods: ash ISO 3987, TBN ASTM D 2896, viscosity ISO 3104, VI ISO 2909.

Low ash or medium ash: which do I need?

The one your engine maker specifies. TotalEnergies says the limited ash level of Nateria MH 40 keeps it compatible with exhaust gas treatment systems and helps keep the combustion chamber and catalyst clean [1].

Low ash, standard duty: Nateria MH 40, a mineral oil with base oils chosen for thermal stability and resistance to nitration and oxidation [1].
Low ash, hard conditions: Nateria MP 40, with hydrocracked base oils that TotalEnergies says significantly increase the oil drain interval [2].
Low ash, high TBN: Nateria MX 40 and MWX 40, for the latest steel piston engines running hotter at high brake mean effective pressure [3, 4].
Medium ash: Nateria MJ 40, for engines that need 0.5 to 1 % ash [5].

Does the fuel gas change the oil?

Yes. The grade has to match the gas as well as the engine. TotalEnergies says the detergency of Nateria MJ 40 neutralises acid components from the fuel in dual fuel engines or from the H2S in biogas [5].

Natural gas: the low ash grades. The MH 40, MP 40 and MX 40 data sheets name natural gas engines [1-3]; Nateria MWX 40’s Jenbacher listing is for gas type A [4].
Biogas, landfill gas, dual fuel: Nateria MJ 40 [5]. Nateria MP 40 also holds MTU Series 4000 biogas and MAN M3271-4 special gas approvals on its data sheet [2].
Changing gas? A switch from natural gas to biogas means re-checking the grade against the engine maker’s list. On Jenbacher engines it also means checking the gas type (A or B).

How should I store and monitor gas engine oil?

Keep it cool and dry, and test it. Every Nateria data sheet says to store the product away from humidity at temperatures not exceeding 35 °C, gives a shelf life of 3 years for unopened drums, and recommends the ANAC GAS oil monitoring program [1-5]. That 35 °C limit is tighter than the 60 °C on many TotalEnergies engine oil sheets; see how to store lubricant drums safely.

Our view

Our opinion: on a remote WA power station, the expensive mistake is a grade that isn’t on the engine maker’s list. Start from the panel above, get your service provider to sign off the grade, then store drums in the coolest part of the site and let oil analysis set the drain interval.

Common questions

What is the difference between low ash and medium ash gas engine oil?: Sulphated ash. TotalEnergies describes Nateria MH 40 as low ash (< 0.5 %), with a limited ash level that keeps it compatible with exhaust gas treatment systems, and Nateria MJ 40 as medium ash (0.5 to 1 %), for engines that need a medium ash oil. Use the level your engine maker specifies.
Which Nateria oil is for biogas or landfill gas engines?: Nateria MJ 40 is the grade TotalEnergies positions for dual fuel engines, biogas engines and low halogen content landfill gas engines; its detergency neutralises acids from the fuel or from the H2S in biogas. Nateria MP 40 also holds MTU Series 4000 biogas (L32FB/L62FB) and MAN M3271-4 special gas approvals on its data sheet. Confirm against your engine maker’s list.
Can I use diesel engine oil in a gas engine?: Not unless your engine maker allows it. Gas engine makers set their own oil requirements (the Nateria data sheets cite, for example, MAN M3271-2 and Caterpillar Energy Solutions 2105/14), and gas engine oils are listed against them.
How long can Nateria gas engine oil be stored?: Each Nateria data sheet gives a shelf life of 3 years for unopened drums, stored away from humidity at temperatures not exceeding 35 °C.
Do Nateria MX 40 and MWX 40 really give longer drain intervals?: TotalEnergies says Nateria MX 40 has proven up to 50 % longer drain intervals than premium Group II gas engine oils, and claims up to 50 % longer drain intervals for Nateria MWX 40, both depending on operating conditions. Set your actual interval with oil analysis and your engine maker’s guidance.
What pack sizes can I buy?: Bulk Lubricants Australia lists all five grades in drums. Ask on the quote form for other packs; we confirm pack, price and freight on the quote.

Where can I buy gas engine oil in Australia?

Bulk Lubricants Australia is an authorised TotalEnergies distributor in Perth. Nateria MH 40, MP 40, MX 40, MWX 40 and MJ 40 are listed in drums. Tell us the grade, engine, quantity and site; we confirm price, pack and freight on the quote. Collect from the TotalEnergies Perth warehouse in Maddington, or we freight to site anywhere in Australia.

Confirm the oil requirement in your engine manual or with your service provider.
Pick the grade from the panel and the comparison table.
Set up oil sampling before the first drain.
Request a price for the grade and number of drums you need.

Request a quote Browse gas engine oils Call +61 459 798 569

Sources

How we checked: on 27 October 2026 we read the five Nateria data sheets above and the “Approved” and “Meets the requirement of” lists on each TotalEnergies Australia catalogue page, and took the weaker wording wherever the two differed. Nateria MP 50 and MWX 50 (SAE 50) are also in our catalogue but are not compared here. Spot an error? Call us or use the quote form and we will correct it.