"Seal swellers" in HM oil
- Thread starter kehyler
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No. It's a conditioner not a sweller.
Right. I switch back and forth, depending on price, without incident.
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Originally Posted by csandste
Right. I switch back and forth, depending on price, without incident.
This I just bought two Jugs of PUP HM from WM for $14 each without rebate.
Yes because it was $8 cheaper!
Right. I switch back and forth, depending on price, without incident.
This I just bought two Jugs of PUP HM from WM for $14 each without rebate.
Yes because it was $8 cheaper!
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I think this stems from some advice from Pat Goss on Motor Week years ago. IMO he was wrong and there's lots of people here who switch without incident.
Unless somebody has proof that I've never been able to find.
Nobody really knows for sure what HM oil really does or doesn't do. I'm of the opinion that HM oil is just another marketing plan to get buyers to pay for something they don't really need. I'll admit I've been tempted to try it, but never have because I've logged a lot of miles on regular Dino and synthetic oils that were not HM.
Nobody really knows for sure what HM oil really does or doesn't do. I'm of the opinion that HM oil is just another marketing plan to get buyers to pay for something they don't really need. I'll admit I've been tempted to try it, but never have because I've logged a lot of miles on regular Dino and synthetic oils that were not HM.
I know Mobil 1 HM oil is higher viscosity and does seem to help if you have small leaks. Never had luck with Valvoline Maxlife that so many others brag about. Haven't used many other HM oils. About to try some STP - autozone brand 10W30 in my 2003 Mercury Sable that i got on clearance a few months back.
So what does a seal conditioner do?
I'm not sure about this, but...
I recently started using M1 HM 10w-30. I don't care for the HM part. I just like that it has a higher HTHS and lower NOACK.
Super Tech Full Synthetic SAE 10W-30 Motor Oil vs. Amazon Basics Full Synthetic are both made by Warren Oil. Are they the same product?
MolaKule
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Originally Posted by kstanf150
Unless somebody has proof that I've never been able to find.
Nobody really knows for sure what HM oil really does or doesn't do. I'm of the opinion that HM oil is just another marketing plan to get buyers to pay for something they don't really need. I'll admit I've been tempted to try it, but never have because I've logged a lot of miles on regular Dino and synthetic oils that were not HM.
Most HM oils have a slightly higher percentage of seal conditioners and in most cases, the basic viscosity is slightly higher as well.
Most seals are elastomers,and seal conditioning chemistry replaces some of elatomer molecules that have been lost to wear and heat.
Are HM oils another avenue of income for oil manf., of course, but they also help high mileage engines in various ways.
Unless somebody has proof that I've never been able to find.
Nobody really knows for sure what HM oil really does or doesn't do. I'm of the opinion that HM oil is just another marketing plan to get buyers to pay for something they don't really need. I'll admit I've been tempted to try it, but never have because I've logged a lot of miles on regular Dino and synthetic oils that were not HM.
Most HM oils have a slightly higher percentage of seal conditioners and in most cases, the basic viscosity is slightly higher as well.
Most seals are elastomers,and seal conditioning chemistry replaces some of elatomer molecules that have been lost to wear and heat.
Are HM oils another avenue of income for oil manf., of course, but they also help high mileage engines in various ways.
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No it's not. Mobil1 HM oils are the same price at WM as the vanilla M1 oils. HTHS and V@100 are on the "thick" side which is why I use them. Also has stopped oil seal seeps in my old junks. So there's "some" proof of usage.
Originally Posted by PimTac
Maybe HM oils had a use back in the day of gaskets and such. Today's engines use more sealants instead.
In my over 40 years of driving and changing oil I have never used a HM oil.
Except valve seals that start seeping oil down the valve stem.
Maybe HM oils had a use back in the day of gaskets and such. Today's engines use more sealants instead.
In my over 40 years of driving and changing oil I have never used a HM oil.
Except valve seals that start seeping oil down the valve stem.
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