Does Your Malibu M6Di Need 0W-40 Oil? What Owners Need to Know
If you own a Malibu or Axis boat powered by a Malibu Monsoon M6Di engine, you may have heard that some M6Di engines now require 0W-40 full synthetic engine oil instead of the previously specified 5W-30.
The important word is some.
Not every Malibu M6Di engine uses the same oil specification, and choosing the correct oil can depend on the engine production date, not simply the model year of your boat.
If you are getting ready for an oil change and aren't sure whether your M6Di should use 5W-30 or 0W-40, here's what you need to know.
Which Malibu M6Di Engines Require 0W-40 Oil?
According to the updated service information applicable to these engines, Malibu Monsoon M6Di engines manufactured between March 1, 2021 and May 31, 2024 may be affected by the updated 0W-40 full synthetic oil requirement.
For an affected M6Di engine, the previous 5W-30 specification should no longer be used. The engine should instead be serviced using the specified 0W-40 full synthetic engine oil and correct oil filter.
This is particularly important because earlier Malibu service information and owner's manuals specified 5W-30 full synthetic oil for M5Di and M6Di engines. As a result, owners researching their boat may still find older information telling them to use 5W-30.
Don't Rely on Boat Model Year Alone
Your boat's model year and your engine's actual production date do not always match exactly.
For that reason, we recommend verifying the engine application before ordering oil based solely on statements such as "2022 Malibu" or "2023 Axis."
If you're unsure, contact the Bakes Online team with your Hull Identification Number (HIN) and we can help identify the correct oil service components for your application.
What Oil Does an Affected Malibu M6Di Use?
Affected Malibu Monsoon M6Di engines require 0W-40 full synthetic engine oil.
Bakes Online offers a complete:
Malibu LT4 & M6Di 0W-40 Full Synthetic Oil Change Kit
The kit includes:
- 8 quarts of Mobil 1 0W-40 Full Synthetic Engine Oil
- Hengst E1001H cartridge oil filter
- The essential oil service components packaged together for compatible Malibu Monsoon M6Di and LT4 engines
The Hengst E1001H is the second-generation cartridge-style filter used on applicable later-production Malibu M-Series engines.
What About M6Di Engines That Still Use 5W-30?
Not every M6Di engine is part of the 0W-40 oil specification update.
For compatible Malibu M5 and M6 engines that continue to require 5W-30 full synthetic oil and use the second-generation cartridge filter, Bakes offers the:
Malibu & Axis M-Series M5/M6 GEN2 5W-30 Oil Change Kit
This kit includes:
- 1 five-quart bottle of Mobil 1 5W-30 Full Synthetic dexos engine oil
- 3 one-quart bottles of Mobil 1 5W-30 Full Synthetic dexos engine oil
- Hengst E1001H GEN2 cartridge oil filter
- 8 total quarts of engine oil
Malibu-branded 5W-30 full synthetic engine oil has been discontinued, so this Bakes service kit now uses Mobil 1 5W-30 Full Synthetic dexos engine oil for compatible applications.
GEN1 vs. GEN2 Malibu M-Series Oil Filters
Oil viscosity isn't the only thing Malibu M-Series owners need to verify.
Malibu M5, M6, and LT4 engines have used different cartridge-style oil filters depending on production date.
The Hengst E1001H GEN2 cartridge filter began appearing on applicable Malibu M-Series engines around April-May 2020. The GEN2 is approximately 4 inches tall.
Earlier GEN 1 engines may use a different, taller Hengst E16H01 cartridge filter.
Because engine production dates can overlap boat model years, inspecting the existing filter before ordering is a good way to help confirm which version you have.
Does the Malibu LT4 Use 0W-40 Too?
Yes, but the LT4 is a different application.
The supercharged Malibu Monsoon LT4 uses 0W-40 full synthetic engine oil along with the appropriate cartridge oil filter.
The Bakes Malibu LT4 & M6Di 0W-40 Oil Change Kit is designed for compatible LT4 applications as well as affected M6Di engines requiring 0W-40.
Do not assume that an M6Di requires 0W-40 simply because the LT4 does. The M6Di requirement depends on the specific engine application and production information.
Why Did Some M6Di Engines Change From 5W-30 to 0W-40?
The updated specification calls for the heavier 0W-40 full synthetic oil on affected M6Di engines.
Marine engines routinely operate under sustained loads that are very different from typical automotive use. Wake and surf boats in particular can spend significant amounts of operating time under heavy load while pushing ballast and maintaining surf or wake speeds.
Using the oil viscosity specified for your particular engine is important for maintaining proper lubrication and engine protection under those operating conditions.
The important takeaway is simple: follow the updated oil specification for your particular engine rather than relying exclusively on an older owner's manual or boat model year.
How Do I Know Which Oil My Malibu M6Di Takes?
Before ordering an oil change kit, check the following:
- Confirm that you have a Malibu Monsoon M6Di engine.
- Determine the engine production date if possible.
- Check whether your engine falls within the March 1, 2021-May 31, 2024 affected production range.
- Check the existing cartridge oil filter to confirm whether you have the GEN1 or GEN2 filter system.
- Review any Malibu or dealer service bulletin/update you received for your specific engine.
If there is any question, don't guess.
Contact Bakes Online with your boat year, model and Hull Identification Number (HIN) and our team can help determine which oil and filter combination is appropriate for your boat.
Which Malibu Oil Change Kit Should I Order?
For an affected M6Di requiring 0W-40:
Shop: Malibu LT4 & M6Di Oil Change Kit – 0W-40 Full Synthetic
For compatible M5/M6 GEN2 engines that continue to use 5W-30:
Shop: Malibu & Axis M-Series M5/M6 GEN2 5W-30 Oil Change Kit
If you're uncertain which kit is correct, contact Bakes Online before ordering and we'll help you verify the application.
Frequently Asked Questions
Does every Malibu M6Di engine require 0W-40 oil?
No. The updated 0W-40 requirement applies to specific M6Di engines. Engines manufactured between approximately March 1, 2021 and May 31, 2024 may be affected. Verify your particular engine before changing oil specifications.
Can I still use 5W-30 in my M6Di?
Compatible M6Di engines that are not subject to the updated specification may still use 5W-30. However, if your particular engine has been updated to the 0W-40 specification, you should follow that updated requirement.
My owner's manual says 5W-30. Why am I being told to use 0W-40?
Earlier Malibu owner's manuals specified 5W-30 full synthetic oil for M5Di and M6Di engines. Later service information changed the oil requirement for certain M6Di engines. Engine-specific updated service information should therefore be considered when servicing an affected engine.
How much oil does the Bakes M6Di oil change kit include?
Both Bakes M-Series service kits discussed above contain 8 quarts of engine oil along with the appropriate GEN2 Hengst E1001H cartridge filter for compatible applications.
What oil filter does a Malibu M6Di use?
Later GEN2 M-Series applications use the Hengst E1001H cartridge oil filter, but earlier engines may use a different filter. Always verify the filter style and production date before ordering.
Can Bakes help determine which oil my engine needs?
Yes. If you aren't sure whether your M6Di requires 5W-30 or 0W-40, contact Bakes Online with your Hull Identification Number (HIN) and boat information so our team can help verify the correct service components.
The Bottom Line
The biggest mistake a Malibu M6Di owner can make is choosing engine oil based only on the boat's model year or an older owner's manual.
Some Malibu Monsoon M6Di engines that originally used 5W-30 full synthetic oil are now subject to an updated 0W-40 full synthetic oil specification. Engines manufactured between March 1, 2021 and May 31, 2024 may be affected.
Verify your engine before your next service, use the correct oil viscosity and filter, and when in doubt, ask before ordering.
At Bakes Online, we've spent decades helping inboard boat owners identify the right maintenance parts for their boats. If you have questions about your Malibu or Axis M-Series engine, contact our team and we'll help point you in the right direction.