This one’s an issue that attracts some differences of opinion.
The options should be pretty straightforward. I’ve generalised the intervals based on 5,000 kilometer increments and converted these to 3,000 mile equivalents for you imperial types.
This entry originally featured a poll, a graphic of which is reproduced here.
Our resident GM tech expert, Tedjs, has chimed in with some advice in comments, which I’ve reproduced below. This concerns not just intervals, but also the type of oil you should use:
Well, I would have to say you can never change your oil too often – but given the cost of fully synthetic oil, and the waste generated when oil is changed one could say that is almost a decision left up to the individual owner.
However (deep breath) –
– the oil life monitor that is used on modern Saab engines is a rather sophisticated software algorithm that uses information based on engine revolutions, operating temperature, startup temperature, drive time and other aspects to optimize the time (not really distance) between oil changes.
Think of it this way – you are changing your oil because of (what)? Not entirely because it gets ‘dirty’ (it is designed to retain contaminates) – the additive package wears out over time and oil loses the ability to do its job.
With that in mind, you can look at this example – a driver that does frequent short trip driving, with no highway driving might find that have to change their oil in LESS THAN the common 3000 mile oil change interval. A driver that drives under what might be considered ‘optimum’ conditions by the system may find that they can go up to 10,000 miles before an oil change. All vehicles recommend an oil change at least once a year.
Drivers in the USA (and all others) – perk up and pay attention to this. The oil life monitor in any GM vehicle has no idea what type of oil is being put into an engine, the ‘software’ assumes that the proper type (standard) and viscosity of oil is being put into the engine so that is what is basis its calculations on. If you decide to use a different type of oil (viscosity or brand) – than the oil life monitors opinion becomes somewhat invalid.
Saab vehicles sold in the USA (and other markets of course) require oil that meets the GM-LL-A-025 (European) oil standard. Some research on my part has found that very few brands oil meet that standard in the United States. Most GM engines – such as the high feature 3.6L V6 used in many new models are factory filled with Mobile One that meets the GM6094M standard or the GM 4718M (Corvette spec) which varies that of the European standard.
The GM-LL-A-025 standard is bit different in terms of how long the oil should be able to ‘resist’ breakdown and the Saab version of the high feature V6 engine (2.8L Turbo) requires oil that meets that standard. From what I have learned only Mobile 1 0W-40 meets those requirements and it is in print on the specification sheet for that oil. Saab recommends this oil be used in all of its engines from what I understand.
So – one of the most important considerations you should be paying attention to is that you are using the proper type of oil for your engine. And from there you should consider a change interval based on your driving style (or follow your oil life monitor if available).
Funny this topic should come up. I just had the dealer do my first oil change in my 9-3 at 7100 miles (11,000 kilometers). My oil life monitor showed about 8% left but they were ‘allowed’ to do it with that much life left (Saab pays for those first few oil changes). I generally do plenty of highway driving and have taken several long trips in my car so – the data seems to support the oil life monitors decision. The car had not used any oil at all in this time frame.
Hard to break the 3000 mile oil change ‘habit’ but given cost factors and longer manufacturer warranties on new(er) vehicle – one has to consider the facts.