I thought this was a simple question but, after talking to 3 different Volvo Service departments and Volvo corporate, I'm just as confused.

2010 Volvo XC60 T6 (only 42K miles and live in North Texas) - What is the recommended oil type?

The manual says Castrol 5w30 and 2 different local Volvo Service departments agreed. Another one said they use Mobil 10w30 in all of their Volvos. Plus, within this dealership, another advisor said you want to go a different route using full synthetic which is much more expensive.

I understand 10w30 is the more widely accepted type but, can I use it and will it cause any problems? Will I get the same performance? Or, do I need to ignore them all and go the synthetic route?

The 10w30 price point is much much cheaper compared to the other service departments. I'm still confused why a dealership would recommend Mobil 10w30, when the owner manual says otherwise. Yes, I know dealerships are individually owned and buying all these different oils can be expensive - they can do what they want. Overall though, doesn't that just confuse the customer????

 

Volvo recommends castrol 5w30 but you can use any other brand as long as its 5w30. Volvo didn't start using synthetic until 2013

 

The two numbers refer to the viscosity at a cold temperature (ie a 5 weight is more fluid at 0F than a 10 weight) and at a warm temp (engine operating temp may vary due to outside temp, load - ie pulling a trailer etc ) which is the 30-40 weight number. If you check in the owners manual you will also see a set of specifications/certification codes which have to do with things like the detergents/sulfer content etc. Volvo specs the oil to the GF-4, API SL, or ACEA A1/B1 standards, so any brand which shows they meet those specs is appropriate to your model. The 5-30 weight recommendation is to give the best compromise of engine protection and economy. Interestingly, my S40 suggests 5-30 if you expect to see temps under 5F or use 10-30 as an option if not... Since north Texas is not as cold has here in CT (we saw -15F a few times this past winter..) using 10-30 doesn't seem to have much of a downside in my opinion.

Now as to the bigger question of traditional dino vs synthetic - synthetic offers more protection from extreme heat ranges and Volvo recommends using if you pull trailers or have more extreme driving conditions (ie driving in mountains is like pulling a trailer). Given your car is fairly new, I'd sway towards using synthetic. You get the equivalent of a 5-40 or 0-40 and a more efficient oil. This is important for cars with variable valve timing mechanisms that rely on oil pressure and clear oil ports (VVT issues are common to the 2000-2005 Volvos). So if you plan is to keep your car for another 100K+ miles, I'd go synthetic (you can find good prices at Walmart or Autozone even if you are not picky about Castrol vs Valvoline etc. Just check the certifications not the brand name.

 

+1 for synthetic, but in reality that decision should be based on how long you keep a car. Less than 150K miles and dino done on time will get the job done. If you are shooting for 200K+ then synthetic is cheap insurance. Driving style can play a part too. Another factor is the turbo. Turbo's are more sensitive to oil quality than the engine itself. And the XC60 is heavy and big enough that the turbo will be used quite a bit even when driven moderately, so if it were me I would error on the side of caution and use synthetic, but if you are one to trade every few years that is less of a factor.

 

I use AMS Oil 5-30 in my 2014 XC60 T6 Turbo Polestar. Since the recommended change interval is 10,000 miles.