Porsche’s March 2026 list of approved Porsche A40 oil runs eight pages, and every entry on it is a named product, not a viscosity. Most owners miss that. A bottle can say 0W-40 and still carry no Porsche approval at all, and a 2022 911 wants a different approval from a 2015 one. For Porsche owners in Long Branch and Shrewsbury, the oil change before winter is the one to get right, because the months ahead are all short trips and cold starts.
Quick Summary: Key Takeaways
- A40 is a list, not a grade: Porsche tests each oil and prints the approved ones by name.
- A40 stops at model year 2020: no newer Porsche is allocated it, and many earlier engines were already on a C spec.
- Approvals run out: every product on Porsche’s lists carries an expiry date.
- Mixing is allowed within one spec: top up with the same brand and type when you can.
Porsche A40 Oil Is a Named Approval, Not a Viscosity Grade
A40 is a Porsche specification, and an oil only meets it if Porsche has tested that exact product and listed it. Porsche’s Manufacturer’s Certificate 02/26, dated March 26, 2026, covers every Porsche up to and including model year 2020 that is allocated A40 oil. Every product on it is a 0W-40 or a 5W-40.
So the grade is only half the label. Two synthetic 0W-40s can sit side by side on a parts-store shelf with the same price and the same flow numbers, and only one of them has passed Porsche’s testing. The proof is that exact product name on Porsche’s current list, so check the bottle against it.
From Model Year 2021, Every Porsche Engine Takes a C Spec
Newer Porsche engines don’t use A40 at all. Porsche’s allocation bulletin 55/21 states that from model year 2021 every Porsche engine must use a 0W oil, and it assigns each engine one of three specs: C40 for 0W-40, C30 for 0W-30 and C20 for 0W-20.
The split surprises people. On that bulletin, a 992 Carrera, a 911 Turbo and every 718 Boxster and Cayman take C40, while a base Cayenne takes C20 and a Macan GTS takes C30. Porsche’s 2020 allocation for US cars kept the 997 and 991 generations of the 911 on A40, so a 2015 Carrera and a 2022 Carrera in the same Shrewsbury garage need different approvals on the bottle, even though both want a 40-weight oil. Older isn’t always A40, either. The 2019 and 2020 718s were already C40, and no four-cylinder Macan sold in the US has ever been an A40 car.
Approvals Expire, So the Label Has to Be Current
An oil that’s approved today may not be in 2028. Porsche’s March 2026 C40 bulletin says each approval is valid for two to three years, and once that window closes it’s revoked unless the oil maker asks for an extension. The list prints an expiry date beside every product. Check it.
Mixing worries owners more than it should. Porsche says approved oils can be mixed as long as they share the same Porsche specification, and switching brands doesn’t call for an engine flush. It still prefers same-brand top-ups. Keep a spare liter. Whatever went in at the last service beats any Porsche approved oil a gas station on Route 36 happens to stock, and it beats a non-approved one by a mile.
Short Winter Trips Are Where the 0W Number Earns Its Keep
The first number in a grade describes the oil cold, and that’s the number winter tests. Porsche’s own definition is plain: a 5W oil is thicker at low temperature than a 0W oil, while a 0W-40 and a 5W-40 match once hot. Oil that’s thinner when cold gets to the bearings and cams sooner after a start.
Most local winter driving never gets the oil hot. A run from Long Branch to Red Bank, then back out to Rumson for dinner, is three cold starts in one evening. Each leg is short. That’s the driving the 0W number is written for, and a Porsche from model year 2021 on is allowed nothing else.
How to Make Sure the Right Oil Goes Into Your Porsche
Ask for the approval by name. Then check the invoice. A quick-lube receipt that reads “full synthetic 0W-40” says nothing about A40 or C40, and that gap is exactly where the wrong bottle slips in.
Massimo Bottino spent 1999 to 2004 as a Master Technician at Contemporary Motors, a Mercedes-Benz dealer, before opening Massimo Motorworks in 2004. The shop’s Porsche guidance calls for manufacturer-approved synthetic oil and a fresh filter at the proper interval, from the classic 911 to the current Cayenne. A 1999 Boxster, a 2016 Cayenne and a 2023 Macan are three separate oil conversations. Porsche’s A40 list even points owners of cars built between 1948 and 2005 toward its separate Classic oils, and a shop that sees all three generations knows to ask.
Frequently Asked Questions
Q: What is Porsche A40 oil?
A: It’s an oil Porsche has tested and named on its A40 approval list, which applies to A40-allocated cars up to model year 2020. A40 isn’t a viscosity, so a 0W-40 or 5W-40 without the listing doesn’t qualify.
Q: Is Porsche C40 the same as A40?
A: No. They’re separate approvals with separate product lists. C40 covers every 2021-and-later Porsche allocated a 40-weight oil, plus some earlier engines such as the 2019–2020 718s, and from 2021 on it means 0W-40. Use whichever spec Porsche allocates to your engine.
Q: Can you mix Porsche approved oils?
A: Yes, as long as both carry the same Porsche specification. No flush is needed when you change brands, though Porsche prefers top-ups in the same brand and type between changes.
Get the Right Approval in Before the Cold Sets In
The Long Branch shop sits at 208 Clinton Pl, Long Branch, NJ 07740, and the Shrewsbury shop at 430 Broad St, Shrewsbury, NJ 07702, roughly six miles from Rumson. When you fill in the request form on massimomotorworks.com, add the model year and the oil named on your last invoice, because those two details tell the technician which Porsche list to check.