I contacted Casrtol for an oil that meets the A/5 specification,
Here is the reply:
Thank you for contacting Castrol North America.
Castrol always recommends following the guidelines of the original engine manufacturer for the recommended grade and API specific to your application. This information can be found in the vehicles owner’s manual or by contacting the manufacturer directly.
When deciding on a formulation, you need to take into consideration factors such as, what type of conditions do you drive in? What kind of protection are you looking for? What is the manufacturer recommending?
According to Castrol’s lubrication guide recommended for a 2018 Genesis G80 3.8L 6-cyl is 5W-30 motor oil.
Effective 2018, ACEA A5/B5 is currently met by the following Castrol products:
- Castrol EDGE 5W-30 U.S.
- Castrol EDGE Extended Performance 5W-30
- Castrol EDGE High Mileage 5W-30
- Castrol EDGE Professional 5W-30
Please note that in the case of ACEA A5/B5, a change in formulation will not always coincide with a bottle label change due to inventory or other reasons. Any of the above listed Castrol EDGE motor oils may be used in your vehicle with confidence.
Thank you again for contacting Castrol. We value your patronage!
Castrol Consumer Relations