There is a new dexos certification out that supersedes the other dexos certs called "dexos®R"
The only weights I see are on the market are 0W40 and 5W50.
To download the PDF file presented below use this link or see the attached PDF file.
Dexos R Frequently Asked Questions
General Statement
• Dexos R was developed to provide customers an optional premium engine oil that further
withstands the rigors of high speed, high load conditions which occur during towing, or
performance driving.
General Questions
• Why was XW-20 and XW-30 included in this specification? What is the emerging need?
➢ Market viability for the specification
➢ Opportunity for oil marketers to differentiate premium formulations
➢ Customer satisfaction/informing
• What is the timing for factory and service fill?
➢ Factory Fill – MY 2022
➢ Service Fill – as soon as available
• Can it be used in place of dexos 1?
➢ Yes
• Can it be used in place of dexos 2?
➢ Dexos R can be used in place of dexos 2 in all GM high-performance gasoline engines.
➢ Corvette owners will be instructed to use dexos R licensed engine oils.
➢ Diesel engines will continue to use dexos 2 or dexosD licensed oils, check vehicle
owner’s manual for recommendation.
• Can it be used in place of dexos D?
➢ No, oils meeting this specification are not suitable for diesel applications
• Which GM engines will be factory filled with this?
➢ Factory fill for current model Corvette and Camaro
• Does dexosR approval generate approval for dexos1 Gen3
➢ Yes, core formulation is approved for both. Blenders will still need to submit application
for licensing to each specification.
• If one formulation has multiple spec approvals will they only have to pay one license fee to
cover all?
➢ Yes, all blender royalty fees are volume based.
• When will this specification be released
➢ Currently published
• When will the TMC system be opened to submit dexosR
➢ May 2021 (est)
• When is the first license planned to be rolled out
➢ May 2021 (est)
Dexos R Frequently Asked Questions
Viscometric Questions
• Which viscosity grades will GM use?
➢ GM cannot provide comments on any future products.
Physical/Chemical Property Questions
• None
GM Test Questions
• GMSPI – Will this specification use the new SPI test (GMSPI3) or the legacy test (GMSPI)?
➢ GMSPI3
ASTM Test Questions
• None
ACEA Test Questions
• M111FE – Why is this included as oils in this specification will be primarily based around ASTM
tests instead of ACEA tests? Oils may not carry an ACEA claim profile.
➢ Required for 0W-40 for Corvette
• OM646LA – This is a diesel wear test. Can this be replaced with the GM bench wear test and/or
other proprietary tests for wear protection?
➢ Wear mitigation is critical and absent a robust wear test this requirement will remain in
the specification until a suitable replacement can be found.
.
The only weights I see are on the market are 0W40 and 5W50.
dexos 2 and dexos R - CorvetteForum - Chevrolet Corvette Forum Discussion
C8 General Discussion - dexos 2 and dexos R - In a couple of threads, a discussion of oil ratings came up. The 2023 Owners Manual says use engine oils that meet the dexos R specification. The previous 2020-2022 manuals specify dexos 2. All the manuals say see gmdexos.com . That site lists oils...
www.corvetteforum.com
To download the PDF file presented below use this link or see the attached PDF file.
Dexos R Frequently Asked Questions
General Statement
• Dexos R was developed to provide customers an optional premium engine oil that further
withstands the rigors of high speed, high load conditions which occur during towing, or
performance driving.
General Questions
• Why was XW-20 and XW-30 included in this specification? What is the emerging need?
➢ Market viability for the specification
➢ Opportunity for oil marketers to differentiate premium formulations
➢ Customer satisfaction/informing
• What is the timing for factory and service fill?
➢ Factory Fill – MY 2022
➢ Service Fill – as soon as available
• Can it be used in place of dexos 1?
➢ Yes
• Can it be used in place of dexos 2?
➢ Dexos R can be used in place of dexos 2 in all GM high-performance gasoline engines.
➢ Corvette owners will be instructed to use dexos R licensed engine oils.
➢ Diesel engines will continue to use dexos 2 or dexosD licensed oils, check vehicle
owner’s manual for recommendation.
• Can it be used in place of dexos D?
➢ No, oils meeting this specification are not suitable for diesel applications
• Which GM engines will be factory filled with this?
➢ Factory fill for current model Corvette and Camaro
• Does dexosR approval generate approval for dexos1 Gen3
➢ Yes, core formulation is approved for both. Blenders will still need to submit application
for licensing to each specification.
• If one formulation has multiple spec approvals will they only have to pay one license fee to
cover all?
➢ Yes, all blender royalty fees are volume based.
• When will this specification be released
➢ Currently published
• When will the TMC system be opened to submit dexosR
➢ May 2021 (est)
• When is the first license planned to be rolled out
➢ May 2021 (est)
Dexos R Frequently Asked Questions
Viscometric Questions
• Which viscosity grades will GM use?
➢ GM cannot provide comments on any future products.
Physical/Chemical Property Questions
• None
GM Test Questions
• GMSPI – Will this specification use the new SPI test (GMSPI3) or the legacy test (GMSPI)?
➢ GMSPI3
ASTM Test Questions
• None
ACEA Test Questions
• M111FE – Why is this included as oils in this specification will be primarily based around ASTM
tests instead of ACEA tests? Oils may not carry an ACEA claim profile.
➢ Required for 0W-40 for Corvette
• OM646LA – This is a diesel wear test. Can this be replaced with the GM bench wear test and/or
other proprietary tests for wear protection?
➢ Wear mitigation is critical and absent a robust wear test this requirement will remain in
the specification until a suitable replacement can be found.
.
