Everybody knows 10W40 is obsolete and sub optimal in almost every form, but what other grades will soon go the way of the dinosaur?
obsolete oil grades
- Thread starter 2EHA
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I don’t know that, should I?
10w-40 may be obsolete but it is plentiful everywhere.
How is 10w-40 "obsolete and sub-optimal"?
I may end up using it in my Santa Fe and it is in my motorcycle now.
I know in other countries, 10w-40 is still widely used.
I may end up using it in my Santa Fe and it is in my motorcycle now.
Popularity and availability =\= quality of oil either.
I know in other countries, 10w-40 is still widely used.
"Everybody knows" is quite a claim. It may be true for you that 10W40 doesn't have a use, but it's not universally true, and some fine oils are available in 10W40.
Were you intending to stir up controversy?
20W20, also 20W50 seems to be hard to locate on store shelves, and when I went looking around for 20W50 Maxlife they've apparently discontinued it in 5qt jugs, the only 20W50 PCMO on Wal-Mart's shelf any more is basic Castrol conventional.
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So, my 9 5quart jugs of M1 10w40 HM that are SN rated are obsolete? Interesting. It’s probably used in other countries
OVERKILL
$100 Site Donor 2021
No OEM calls for it as far as I know, so it has no OEM approvals meaning there are very few hoops it has to jump through. Historically 10w-40 was probably the poorest grade, using thin bases and loads of VII. It didn't need high-end bases (synthetic) because nobody approved it, unlike 5w-40.
I'm sure there were some decent 10w-40's produced for specific applications, like maybe a bike oil, but as far as PCMO's go, they were pretty much as bad as it got.
OVERKILL
$100 Site Donor 2021
Just a few data points from the PQIA site:
1. Kendall GT-1 Semi-Syn 10w-40 (SN): Noack 11.7%
2. Pennzoil yellow bottle 10w-40 (SN): Noack: 12.8%
3. Chevron Supreme 10w-40 (SN): Noack: 10.8%
4. Castrol GTX 10w-40 (SN): Noack: 11%
5. Chevron Havoline 10w-40 (SN): Noack 13.1%
6. Mag1 10w-40 (SN): Noack 10.8%
7. Citgo SuperGuard 10w-40 (SN): Noack 14.6%
Hilarious one: XCEL 10w-40 has no freakin' additives!!! http://www.pqiadata.org/Xcel_10W40.html
All Euro 5w-40's and 0w-40's have Noack volatility figures of less than 10%. M1 0w-40 is 8.8% for example.
On top of that, all the above 10w-40's have SN PCMO levels of additives, even though not required to because of being an xW-40. This means that not only do you get garbage base oils with high volatility and lots of VII, but you don't get a more robust additive package like you'll get with a Euro 0w-40/5w-40.
1. Kendall GT-1 Semi-Syn 10w-40 (SN): Noack 11.7%
2. Pennzoil yellow bottle 10w-40 (SN): Noack: 12.8%
3. Chevron Supreme 10w-40 (SN): Noack: 10.8%
4. Castrol GTX 10w-40 (SN): Noack: 11%
5. Chevron Havoline 10w-40 (SN): Noack 13.1%
6. Mag1 10w-40 (SN): Noack 10.8%
7. Citgo SuperGuard 10w-40 (SN): Noack 14.6%
Hilarious one: XCEL 10w-40 has no freakin' additives!!! http://www.pqiadata.org/Xcel_10W40.html
All Euro 5w-40's and 0w-40's have Noack volatility figures of less than 10%. M1 0w-40 is 8.8% for example.
On top of that, all the above 10w-40's have SN PCMO levels of additives, even though not required to because of being an xW-40. This means that not only do you get garbage base oils with high volatility and lots of VII, but you don't get a more robust additive package like you'll get with a Euro 0w-40/5w-40.
there’s a 10w40 pcmo worth buying in the year 2020?
Looks like a good Summer beer!
GM used to love to print in their owners manuals to explicitly not use 10w-40, probably because 50-60 years ago 10w40 was infamous for sludging up engines, because they were taking a solvent refined base oil that could meet 10W and loading them with a ton of VIIs. Modern 10W40 is heaps better but almost every OEM now recommends an Xw20 or Xw30 oil, and when 40 grade is called for it's usually some special spec oil like Corvettes calling for mobil1 ESP or a European car oil where really the European spec is more specific than which SAE grade it falls under. I've noticed 10w-40 seems to be dissapearing from retail shelves, there's still more of it around than 20w50 but eventually I can see it becoming a non-stocked special order item at most places.
I’ve used Mobil 1 HM 10W-40 in my old Accord lots of times. It’s ACEA A3B3, what’s wrong with it?
that’s not exactly impressive
Sure. Mobil, Penrite, Amsoil, which have synthetic, current offerings in 10W40.
Maybe your car doesn't specify it, but that hardly makes it obsolete.
AutoMechanic
Site Donor 2024
10W-40 is still available everywhere in my area except Walmart. Walmart stopped carrying it recently when I asked the manager why he had said they don’t sell a whole lot of it so for the location only they stopped carrying it in everything except the SuperTech brand. So it’s not totally obsolete.
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