Amazon has
5-Quart Castrol Edge High Mileage Advanced Full Synthetic Motor Oil (0W-20) for $22.32 - 5% when you check out via Subscribe & Save =
$21.20.
Shipping is free w/ Prime or on $35+ orders.
Thanks to Community Member
SUCHaDEAL for finding this deal.
About this item:
- Phosphorus Replacement Technology to help extend the life of the emission system
- Reduces leaks, oil burnoff and power robbing deposits
- 15,000 miles between oil changes*
- Meets or exceeds the following specifications: API SP/SN PLUS/SN/SM | ILSAC GF-6 | Meets engine test requirements of Chrysler MS 6395 | Meets Ford WSS-M2C947-B1 | Meets Ford WSS-M2C962-A2
- *Or one year, whichever comes first
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That all goes back to a famous lawsuit between Mobil and Castrol in the 1990s (yes, that Castrol).
Base oils are traditionally classified into five groups. Groups I, II, and III are derived from conventional crude oil. Groups IV and V are what were originally considered real synthetics — chemically engineered hydrocarbons like PAO, esters, polyglycols, or silicone. Mobil pioneered much of this technology.
For a long time, only Group IV and V oils could legally be labeled "synthetic," and they commanded a premium because they retained their physical properties far better.
In the 1990s, Castrol started using highly processed Group III base oils and marketing them as synthetic. Mobil sued, arguing that Group III was still conventional oil. Mobil lost. Castrol's argument was that Group III oils are so heavily processed that calling them synthetic was justified.
Fast forward to today: in the U.S. (but not in places like Germany or Japan), "synthetic" can legally mean Group III, IV, or V. So "100% synthetic" can be 100% Group III — which pre-1990 would not have been considered synthetic at all.
"Synthetic blend," meanwhile, can be basically any mix of Group I–II with Group III–V.
So yes — Castrol Edge High Mileage Advanced Full Synthetic made in the U.S. is, you guessed it, Group III. But Castrol Edge Full Synthetic made in Germany (even with the same name) is typically a true Group IV oil.
Given how screwed up the labeling system is, I just stick with Costco.
65 Comments
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I just stick with Costco.
https://www.mobil.com/en/lubrican...il-1-0w-20
If you're looking for some good, honest info on motor oil, I would suggest you watch a few of Lake Speed's videos on YouTube.
https://www.youtube.com/@themotoroilgee
.
* You have leaks
* Oil analysis of used oil has found metals in the oil
* You're selling the car and just want it to last a bit longer with less risk
I recommend doing an oil analysis every couple of years unless/until they find someone, or you have a rare car. Then do it 1-2 times a year or more if needed.
High mileage oil can clog your catalytic converter needlessly. Most engines today don't need it unless there's a good reason.
As long as you change the oil every 6 months or 5K miles it doesn't matter if you use Costco or any brand of synthetic oil. This is for non commercial use. For commercial use, change oil every 3K miles as commercial vehicles like taxis and limos idle a lot. Regular maintenance will keep your vehicle running way more than neglected vehicles of the same brand, model and age.
Research if your car needs a 3k change interval. Camshaft, timing chains, etc. Manufacturers often can screw this stuff up so even a hint of dirt in the oil can break them.
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Of course a lot different for personal vehicles. A lot of BS with marketing especially with the high mileage or whatever.
In my experience with our hondas j37 or j35 engines with 180k+ miles, they get at least from our experience from either the thin valve covers rotting through or valve cover gaskets and VTech solenoid gaskets leaking which is a very common issue.
Bottom line is get the what they consider full synthetic which suspenseds the solids and a magnetic drain plug or put a magnet on the oil filter over conventional oil.
After viewing many YouTube videos I decided to try the Valvoline restore and protect which slowly takes out the varnish and sludge. Might take one or two oil changes then I'll go back to the regular full synthetic for cheap like I posted earlier for $15 for a 5 gallon jug from tractor supply now.
Basic costco, tractor supply and walmart store brands "full" or fool(what I call them)synthetic oils are all made by Warren. I bet minimal or no additive packages in each. Same stuff different packaging.
Mostly all about the leakage at the mileage.
They call for the same engine 5W20 in the US and 5W30 in Europe, Asia, and Australia. It's all about the CAFE standards along with shutting the engine off at stop lights to get the mileage up for US government standards. Total BS.
If you're looking for some good, honest info on motor oil, I would suggest you watch a few of Lake Speed's videos on YouTube.
https://www.youtube.com/@themotoroilgee
.
That all goes back to a famous lawsuit between Mobil and Castrol in the 1990s (yes, that Castrol).
Base oils are traditionally classified into five groups. Groups I, II, and III are derived from conventional crude oil. Groups IV and V are what were originally considered real synthetics — chemically engineered hydrocarbons like PAO, esters, polyglycols, or silicone. Mobil pioneered much of this technology.
For a long time, only Group IV and V oils could legally be labeled "synthetic," and they commanded a premium because they retained their physical properties far better.
In the 1990s, Castrol started using highly processed Group III base oils and marketing them as synthetic. Mobil sued, arguing that Group III was still conventional oil. Mobil lost. Castrol's argument was that Group III oils are so heavily processed that calling them synthetic was justified.
Fast forward to today: in the U.S. (but not in places like Germany or Japan), "synthetic" can legally mean Group III, IV, or V. So "100% synthetic" can be 100% Group III — which pre-1990 would not have been considered synthetic at all.
"Synthetic blend," meanwhile, can be basically any mix of Group I–II with Group III–V.
So yes — Castrol Edge High Mileage Advanced Full Synthetic made in the U.S. is, you guessed it, Group III. But Castrol Edge Full Synthetic made in Germany (even with the same name) is typically a true Group IV oil.
Given how screwed up the labeling system is, I just stick with Costco.
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This is probably the same as Kirkland, Walmart and Amazon oil.
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