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Mazda Skyactiv has an air/oil separator. (before the PCV valve) Still if there is a market you can be sold a can. (money before brains)

We all would chip in a quarter for gas and hop in Rusty’s 67 Camaro and go down to Huntington Beach. Our bathing suits were shorts cut from blue jeans, normal for that day.

If you just focus on the oil side of it then your whipping boy is CAFE regulations and your super powers to bearing wear is HT/HS higher viscosity. The bigger picture is the fuel blend in the world region used, and all the hardware in the modern engine designed to work for the oil. I can even...

Balance is really the key.

Thanks for the info… Not a “regular” here….

Interesting test of old oil.

I did pick PUP due to the Borate Ester additive. https://bobistheoilguy.com/forums/threads/unveiling-the-superiority-of-pennzoil-ultra-platinum-oil-a-detailed-analysis-by-mr-lake-speed-jr.370226/

Moly is an element, it is bonded to sulphur in different amounts to form a molecule. It works as intended when the oil gets hot. Boron also is not the straight boron atom just a form that works in oil and works in cold start oil. Not that I know a whole lot about it but they are not a moly or...

Looks like my 2019 Miata. The Skyactiv is kinda picky on the oil filter due to the dual PSI oil pump. Mazda OEM oil filter recommended, but one aftermarket filter is made to cater to the Skyactiv engine. I started with a high moly oil but setteled with Pennzoil Ultra Platinum. Personally go with...

Here is a post from 2009. https://bobistheoilguy.com/forums/threads/how-long-has-5w20-been-around.115391/ 5w20 was originally not synthetic.

Kinda like engine technology is hardware and oil is software. Like the info that USA/Canada does not control the world view with its CAFE regulations. Get used to thin, here to stay. (for some engines) 5w20 has been around for some engines for a really long time and seems to work fine.

But proof is how long they last at the recommended viscosity. Somehow they will always say they know better than another. The majority follow the recommendations. Even the military has reduced viscosity with little regard to CAFE laws and had not taken a hit on reliability. New engines are...

Mobil 1 formulations have changed, not saying better or worse. TGMO has a strong additive package with a lot of dinuclear moly but I quit using it when found the base oil inferior to GTL base. Now use Pennzoil Ultra Platinum with a strong additive package and GTL. Definately wait for the rebate...

Thank you.

Just thinking from my view. The turbo increases the load on the main bearings. Maybe secondary the oil temperature at the turbo bearings.

Just thinking about Mazda… (I like them) Add a turbo to same engine and they go from 0w20 to 5w30. As far as a modern engine with variable or pulsed output oil pumps controlled by ECM and VVT I prefer not to shoot from the hip.

Sad but true… Personally think going over car manufactured recommended viscosity is kinda stupid. Except when you add a turbo to the engine. That throws the same engine into a higher oil viscosity.

Many different temperatures inside the engine and one factor to consider to have a higher viscosity is a turbo. Just a guess but maybe the GM engineer is considering that.

I understand what you are saying. Here is my view… The oil filter usually has a check valve that allows a lot of resistance to complete drainage along with the gear oil pump. Bet there is no issue at parking at the airport. However draining the oil for a week with the purpose of complete oil...

Guess we see things a bit different. But from my thinking allowing the upper engine to drain that long has gotta be bad when you start the engine. Oil takes time to fully pump up to fill all the oil system as opposed to short oil change time. The difference is the oil pump is completely drained...