M1 5W20 High Mileage in a NEW car

H

hunter7389

Joined
Feb 26, 2021
Messages
5
Well, I have a stock of the 12QT boxes of M1 5W20HM from the walmart fest last year, 60ish quarts...

And a 2K mile 2021 Mustang GT. Would you hesitate to run in in this car? Or maybe just unload the oil cheap on marketplace and run with Castrol Edge or similar, non HM?
 
Lots, and lots of threads on that topic as well as information on manufacturer websites. ExxonMobil for one. All oils have seal "conditioning" additives and if they are API licensed then they fall within the seal swelling limits permitted by the license. ACEA sequences and manufacturer approvals also have limits.

High mileage oil in new car

I have been trying to research high mileage oil in a new car. People seem to think either, there is absolutely nothing wrong (including Valvoline) or be polar opposite and say don't do it as it can cause damage. Some people here also seem to think using a high mileage oil before leaks occur...
bobistheoilguy.com

High Mileage Oil, New Car?

2011 wrx 23k...i usually get Rotella T6 but walmart is out quite often and the only Mobil 1 they have in 40w is High Mileage 0W-40...would I really cause seal leaks etc using it in a newer car or would it be safe?
bobistheoilguy.com

High Mileage Synthetic Oils in Newer Cars?

Is there any reason not to use "High Mileage" type full synthetic oils (like Valvoline or M1) in newer cars? I would think all engines, regardless of the mileage, would benefit from the improved seal conditioning, viscosity stability and cleaning properties.
bobistheoilguy.com

High Mileage Oil in a Low Mileage Engine?

Is there any advantage in using an HM synthetic oil in a lower milegae engine? Any drawbacks? The oil in question is Valvoline Synthetic 5W-30 High Mileage (for engines with over 75,000 miles). Thanks.
bobistheoilguy.com

HM oil in low mileage car?

I've been reading through the various posts about high mileage oils, and it seems the main thing is that they contain "seal conditioners", right? Is there any problem using that kind of oil in a relatively new vehicle? Will the seals become dependent on the conditioners to stay sealed...
bobistheoilguy.com

Is it okay to use High Mileage oil just once?

Thinking about changing oil today, g/f has used conventional in her engine for quite awhile, I have a high mileage oil that I picked up on sale. Is it okay to use HM just once or should I stay with conventional or some synthetic. thanks
bobistheoilguy.com

High Mileage Oil switch no leaks/consumption

If you aren't burning any oil or have any leaks is it still a good idea to switch over to a HM oil at 75-80k? Is the main reason it's recommended due to preventive high dosages of seal conditioners so future leaks don't start? I've read/watched conflicting information regarding a lot of previous...
bobistheoilguy.com

okay to run Mobil High Mileage from the beginning?

Reading through Mobil1.com it says the high mileage oils are for cars with over 75,000 miles. The oil is slightly thicker, has seal conditioners, and more detergents to clean-out sludge/varnish. So why wait until 75000? Couldn't customers run this oil from the very first oil change? ALSO...
bobistheoilguy.com

High Mileage Oils & Seal Conditioners

I think one of the overlooked benefits of High Mileage oils are the extra seal conditioners found in these products. MaxLife blend for example uses conventional and some synthetic base oils, but the key to these oils are the extra seal conditioners which do work. Valvoline is claimed to have...
bobistheoilguy.com
 
Despite popular belief that car have soul and knows what type of oil it has, car DO NOT have soul.
So, cars or vehicle or engine in general, don't care as long as it has oil.
They don't even know if it has been changed, either.
 
Mobil recommends against it, but it technically meets your owners manual requirements.
 
The Critic said:
Mobil recommends against it, but it technically meets your owners manual requirements.
Click to expand...
Can you link to that specific recommendation on their site?

Valvoline certainly doesn't say that:

team.valvoline.com

When You Should Use Start Using a High Mileage Oil

Our cars aren’t alive, but wear and tear takes its toll on our cars’ engines and this tends to start becoming acute at around 75,000 miles.
team.valvoline.com team.valvoline.com
 
Strictly as an amatur poster and not read any of kschachn’s linked history post high mileage oil is a big red flag for me. The only time I would try it is if oil seals were leaking. But if you do use it, stay with it and do not go back.
 
kschachn said:
Lots, and lots of threads on that topic as well as information on manufacturer websites. ExxonMobil for one. All oils have seal "conditioning" additives and if they are API licensed then they fall within the seal swelling limits permitted by the license. ACEA sequences and manufacturer approvals also have limits.

High mileage oil in new car

I have been trying to research high mileage oil in a new car. People seem to think either, there is absolutely nothing wrong (including Valvoline) or be polar opposite and say don't do it as it can cause damage. Some people here also seem to think using a high mileage oil before leaks occur...
bobistheoilguy.com

High Mileage Oil, New Car?

2011 wrx 23k...i usually get Rotella T6 but walmart is out quite often and the only Mobil 1 they have in 40w is High Mileage 0W-40...would I really cause seal leaks etc using it in a newer car or would it be safe?
bobistheoilguy.com

High Mileage Synthetic Oils in Newer Cars?

Is there any reason not to use "High Mileage" type full synthetic oils (like Valvoline or M1) in newer cars? I would think all engines, regardless of the mileage, would benefit from the improved seal conditioning, viscosity stability and cleaning properties.
bobistheoilguy.com

High Mileage Oil in a Low Mileage Engine?

Is there any advantage in using an HM synthetic oil in a lower milegae engine? Any drawbacks? The oil in question is Valvoline Synthetic 5W-30 High Mileage (for engines with over 75,000 miles). Thanks.
bobistheoilguy.com

HM oil in low mileage car?

I've been reading through the various posts about high mileage oils, and it seems the main thing is that they contain "seal conditioners", right? Is there any problem using that kind of oil in a relatively new vehicle? Will the seals become dependent on the conditioners to stay sealed...
bobistheoilguy.com

Is it okay to use High Mileage oil just once?

Thinking about changing oil today, g/f has used conventional in her engine for quite awhile, I have a high mileage oil that I picked up on sale. Is it okay to use HM just once or should I stay with conventional or some synthetic. thanks
bobistheoilguy.com

High Mileage Oil switch no leaks/consumption

If you aren't burning any oil or have any leaks is it still a good idea to switch over to a HM oil at 75-80k? Is the main reason it's recommended due to preventive high dosages of seal conditioners so future leaks don't start? I've read/watched conflicting information regarding a lot of previous...
bobistheoilguy.com

okay to run Mobil High Mileage from the beginning?

Reading through Mobil1.com it says the high mileage oils are for cars with over 75,000 miles. The oil is slightly thicker, has seal conditioners, and more detergents to clean-out sludge/varnish. So why wait until 75000? Couldn't customers run this oil from the very first oil change? ALSO...
bobistheoilguy.com

High Mileage Oils & Seal Conditioners

I think one of the overlooked benefits of High Mileage oils are the extra seal conditioners found in these products. MaxLife blend for example uses conventional and some synthetic base oils, but the key to these oils are the extra seal conditioners which do work. Valvoline is claimed to have...
bobistheoilguy.com
Click to expand...
Touche'. Thanks!
 
kschachn said:
Can you link to that specific recommendation on their site?

Valvoline certainly doesn't say that:

team.valvoline.com

When You Should Use Start Using a High Mileage Oil

Our cars aren’t alive, but wear and tear takes its toll on our cars’ engines and this tends to start becoming acute at around 75,000 miles.
team.valvoline.com team.valvoline.com
Click to expand...
Mobil's recommendation has always been different than Valvoline and they used to state this in their FAQ section.

I sent an email to Mobil and will post the reply once I receive one.
 
hunter7389 said:
Well, I have a stock of the 12QT boxes of M1 5W20HM from the walmart fest last year, 60ish quarts...

And a 2K mile 2021 Mustang GT. Would you hesitate to run in in this car? Or maybe just unload the oil cheap on marketplace and run with Castrol Edge or similar, non HM?
Click to expand...
Yes because it's 5w20.
 
Bill_W said:
Strictly as an amatur poster and not read any of kschachn’s linked history post high mileage oil is a big red flag for me. The only time I would try it is if oil seals were leaking. But if you do use it, stay with it and do not go back.
Click to expand...
Over the last 16 years I have done it several time and gone back and forth. I've seen no adverse effects!
 
If I was ypu, I would use that oil in your Mustang with no fear at all.

I drive a brand new 2020 Honda Accord Hybrid that calls for 0W20. I am using 0W16 and most of the guys on the Accord forum say something will happen to my car. Guess what? Nothing will happen.

Also, I have mixed 0W20, 0W20 high mileage, 5W20, and 5W30. I mixed all 4 for one oil change. Car drove great! The car didn't feel anything different. I currently have 4 quarts of 0W16 in my car and it is going great!

I have a stash of oil at home that I bought for $2 a quart. Enough for 6 more oil changes. I have a combination of different weights.

So, I have decided that my next oil change will be mixing; 2 quarts of 0W16, 1 quart of 0W20 high mileage and 1 quart of 10W30! My car takes 4 quarts for an oil change. I will mix all that for my next oil change. My car will still drive great. I still get 55.9mpg!

Here is my odometer as I just pulled up at home tonight. 55.9mpg so far on this tank of gas after 475 miles so far. I do hypermile. This is 50% highway and 50% city driving. Tires set at 40psi, instead of Honda recommended 33psi.
ORtHVIh.jpg
 
I will not used high mileage oil low mileage car because high mileage oil higher % seal conditioner/ swealler maybe 1 qt max if 6 qts capacity after 100k it will go hm oil.
 
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