What is algorithm to calculate oil change?

[PoCoBob]

Has anyone ever seen a Blackstone report saying the oil should be changed because it's been tested and it turned out to be over a year old? That is a marketing department who came up with that. However, oil can go bad before the advertised maintenance schedule if the engine never completely warms up, ie: short trips. Dirt is the worst thing that can get into the oil and moisture would be second. Unless the oil reaches a temp that will evaporate any moisture in it a few times a month the moisture will build up in it and that is bad for metal components. So short trips, change it more often, long trips every five or six thousands miles.

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[engineermike]

On the 1 year max interval, it has to do with corrosion inhibitors and their useful life. But, it makes a big difference if the car sits outside in a humid environment with lots of temp swings vs steady temp and low humidity. The car doesn’t know which environment it’s in so it defaults to 1 year max. On engines I don’t hit the hours or miles with, I go 2 years because they all are stored indoors.

 

[Noleftist]

Some of my concerns are what road tracking my car does to the fluids and then daily driving it. I would think in some ways tracking the car is good for it such as moisture is never allowed to build up in the engine and it’s obviously getting up to the operating temperature and possibly above so it’s burning off any type of gas or water that gets into the engine.
I would assume the possibly detrimental things would be the coyote GEN three engine shearing oil. This is why I wonder if a 5W 50 motor oil like the Mobil 1 SUPERCAR would not be a great choice because it has the 5W that is good down to approximately -25° and then the 50 weight that is great for the track and then is the oil shears down then it’s good for daily driving.
Also, The 50 would possibly combat the gasoline getting past the rings and resist washing the oil off the cylinder walls.
These are just my thoughts.
I am open to wisdom and correction of my thoughts.

 

[engineermike]

5w50 isn’t a bad way to go. Just make sure it’s acea a3/b4. But if you can find a 5w50 that doesn’t shear terribly I’d love to hear about it. I landed on redline. It still shears but it starts out close to a 60 so it can afford to. Another excellent option is qs or pennzoil euro 5w40.

 

[Noleftist]

Supposedly Corvette and Mobil 1 made the 5W-50 for the Corvette. It’s API SP rated and it’s got Dexos R rating if that means anything.

 

[Noleftist]

5W-50 SUPERCAR:
Properties and Specifications

Property	0W-40	5W-50
Grade	SAE 0W-40	SAE 5W-50
Calcium, mass%, ASTM D4951	0.17	0.073
Density @ 15.6 C, g/ml, ASTM D4052	0.8408	0.8495
Flash Point, Cleveland Open Cup, °C, ASTM D92	232	230
Kinematic Viscosity @ 100 C, mm2/s, ASTM D445	12.9	18.1
Kinematic Viscosity @ 40 C, mm2/s, ASTM D445	69.0	111.8
Magnesium, mass%, ASTM D4951	0	0.074
Molybdenum, mass%, ASTM D4951	0.008	0.0165
Phosphorus, mass%, ASTM D4951	0.09	0.11
Pour Point, °C, ASTM D97	-51	-48
Total Base Number, mgKOH/g, ASTM D2896	8.5	9.6
Zinc, mass%, ASTM D4951	0.1	0.12

 

[Noleftist]

No, I’m not affiliated with Mobil in any way shape or form. I just get the impression that they make good oil.

From Mobil 1 site:
Mobil 1 SUPERCAR 5W-50 it’s the only motor oil carrying the dexosR-spec required by the hand-built 670-hp mid-engine masterpiece. Super enough?

Only the highest performance GM engines are being factory filled with Mobil 1 Supercar. This includes the most powerful Corvette, Cadillac, and Camaro models that feature the LT1 or LT4 engines, and any future engines that require a dexosR-approved motor oil. Not only that, the Mobil 1 Supercar family of products are the first to receive the coveted dexosR-approval.

For now, Supercar 5W-50 is exclusively for the 2023 Corvette Z06 powered by the 5.5L LT6 engine, the highest horsepower, naturally-aspirated production V-8 found in a production car today.

Is Mobil 1 Supercar 5W-50 the same as Mobil 1 FS X2 5W-50?
Mobil 1 Supercar 5W-50 advanced synthetic motor oil is the result of almost 24 months of grueling tests and precise engineering and is dexosR-approved. While the viscosity looks the same, the formulation of Mobil 1 Supercar 5W-50 is specifically designed to guarantee it meets the strict dexosR-spec required for the venerable eighth-generation Corvette Z06.

• Single oil for street and track use

• Enhanced frictional properties help enable improved fuel economy, higher horsepower and reduced engine wear

• Active cleaning agents help enable lower operating temperatures and longer engine life

• Outstanding thermal and oxidation stability help to reduce oil aging

• Excellent aeration control

• Catalytic converter compatibility (only applicable for Mobil 1™ Supercar 0W-40) in my opinion: This is due to the higher zinc in the 5W-50 which equals better protection, but harder on the cats, if you use it and nothing else for 100,000 miles.

 

[Noleftist]

Just in case you want more info about the different mobile, one oils and their zinc and phosphorus content. Also what their recommendations are.
https://www.mobil.com/lubricants/-/...-1/pdf/emsga-mobil1productguide-v2-9-1-22.pdf

 

[WildHorse]

Do any of you know for a fact is the oil life monitor/OLM based on conventional oil or blended oil or Synthetic?

FORD puts a semi-synthetic oil in the engine from the factory. So it's based on that.

 

[Noleftist]

Here’s a motor oil video that I found very interesting. It is specifically based more so on the Corvette and Camaro engines, but he mentions the Mustang in it.
I think a lot of you will find it informative.

 

[murick]

The actual oil wear depends on several factors, which are individual - climate, driving style, and stress. This is why continental Europe gets different recommendation from Canada, or Mexico. The same for (occasional) track use vs daily driving, or short vs long trips.
What works for one may not work for the other.
The easiest way to figure out, how your oil is doing is sending it for an analysis and go from there.
The manufacturer recommendation to be on the safe side shoots for "works for all".

 

[ben1]

Interesting video:

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