What Brand Oil for a 2018 Buick Regal Sportback

I thought the latest on LSPI in GMs are to use a low calcium oil that meets/exceeds Dexos 1 Gen 2...GM uses a Mobil product that is full synthetic (likely similar to Mobil Super Full Synthetic)...I'd like to read more as the GF's 2013 Malibu 2.0T has been fed Mobil 1 5W30 for most of it's life...

enjoy that Regal Sportback...wish Opel had remained with GM and that they still made the sportback, GS and TourX

Bill
 
I thought the latest on LSPI in GMs are to use a low calcium oil that meets/exceeds Dexos 1 Gen 2...GM uses a Mobil product that is full synthetic (likely similar to Mobil Super Full Synthetic)...I'd like to read more as the GF's 2013 Malibu 2.0T has been fed Mobil 1 5W30 for most of it's life...

enjoy that Regal Sportback...wish Opel had remained with GM and that they still made the sportback, GS and TourX

Bill
We rented an Opel when we went to Ireland in 2018. I forget what model, I'll have to dig up the pics, but it was similar to a Buick here in the states. Was a nice car.
 
Not really, or at least not documented. Blackstone (which are most of the UOA on this site) is incapable of properly measuring viscosity and is even more incapable of determining whether a deviation is due to mechanical shear or fuel dilution. Besides, whether an oil undergoes mechanical shear is highly dependent on the specific engine. SOPUS Products does not use cheap VII either.
Here's two (technically three) Pennzoil Platinum UOA's by Wix and Napa that show Pennzoil Platinum 5w-30 shearing into, or very close to 5w-20 range from the last year, first page of search results for "Pennzoil Platinum"

F150 2.7l

2012 Regal
 
Actually the upper limit for 20 grade is 9.29 cSt per SAE J300, and of course PP 5W-30 should work just as well as any other D1G2 approved oil because it has passed all of the same tests. It's factory fill in my Jeep Cherokee 2.0L turbo and it's what I use with 100% confidence.
My mistake thank you for the correction on the upper limit.
 
Here's two (technically three) Pennzoil Platinum UOA's by Wix and Napa that show Pennzoil Platinum 5w-30 shearing into, or very close to 5w-20 range from the last year, first page of search results for "Pennzoil Platinum"

F150 2.7l

2012 Regal
Neither one tested for fuel, correct? Especially on the DI engine I'm still not buying that it's mechanical shear.

Lots of people like to blame it on shear but there's precious few that are confirmed. The one with the Ford where I participated is full of yapping but like I mentioned in the thread, no proof of what happened at all.
 
Neither one tested for fuel, correct? Especially on the DI engine I'm still not buying that it's mechanical shear.

Lots of people like to blame it on shear but there's precious few that are confirmed. The one with the Ford where I participated is full of yapping but like I mentioned in the thread, no proof of what happened at all.
Looks like you're correct on the lack of fuel dilution testing for those tests.

Here's another 2.7l F150 UOA from 2020, not blackstone, with fuel test (1.5% dilution), at 9.4cst. Link

Looks like the oil in that test held viscosity pretty well for the mileage it was used for, but barely hanging on.

Like I said before, it's still a Dexos 5w-30, but I'd just prefer a different oil with a little more insurance. It's a great value, especially with a sale or rebate for a daily.
 
Like most people say here, just use a 5w-30 Dexos oil and it’ll be fine.

The thing to watch out for is that GM issued a TSB on using oil filters with too low of a by-pass pressure setting. It should be something above 20 psi. Some aftermarket ones are set too low. The good news is that the OEM AC filter is fine and the recommended Fram and Wix/Napa filters have the correct bypass pressure. I just slap a Fram XG12060 on my Regal and call it a day.

I’ve had my TourX for almost two years and it’s been totally reliable. Possibly the best car I’ve ever owned.
 
Like most people say here, just use a 5w-30 Dexos oil and it’ll be fine.

The thing to watch out for is that GM issued a TSB on using oil filters with too low of a by-pass pressure setting. It should be something above 20 psi. Some aftermarket ones are set too low. The good news is that the OEM AC filter is fine and the recommended Fram and Wix/Napa filters have the correct bypass pressure. I just slap a Fram XG12060 on my Regal and call it a day.

I’ve had my TourX for almost two years and it’s been totally reliable. Possibly the best car I’ve ever owned.
People who know Buicks know they are a fantastic value.
 
I thought the latest on LSPI in GMs are to use a low calcium oil that meets/exceeds Dexos 1 Gen 2...GM uses a Mobil product that is full synthetic (likely similar to Mobil Super Full Synthetic)...I'd like to read more as the GF's 2013 Malibu 2.0T has been fed Mobil 1 5W30 for most of it's life...

enjoy that Regal Sportback...wish Opel had remained with GM and that they still made the sportback, GS and TourX

Bill
I read that Opel is profitable under its new ownership...something GM couldn't accomplish for many years...
 
I would never use anything less than a full synthetic and any engine with a turbo. It is a matter of the higher flash point and protecting the turbo from coking. My Mustang ecoboost gets M-1 5w-30. 5w-30 is what Ford recommends for it.
 
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