Do the warm oils penetrate the skin the same way as a normal oil would after manual warming?

Question

By warm oils I mean "pepper seed oil", and "sesame oil".
These oils are said to have inherent warmth due to which they increase blood circulation.

The secret of essential oils' effectiveness lies in the speed at which they are absorbed through our skin. They can reach the blood stream in 20 minutes to half an hour maximum.

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Triphala Guggulu contains the detoxfying action of triphala with the penetrating action of guggulu.It is said to promote normal cholesterol levels, support proper weight management and remove deep seated toxins from joints and tissues.

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Guggulu's English name

If I warm a normal oil manually (assuming it is absorbent), will it penetrate the same way as those warm oils? In India normally we apply "coconut oil" to our hair. Also, sometimes the oil of "Indian gooseberry".

EDIT 1:
From dailyglow.com:

DIY Hot-Oil Treatments It’s easy to whip up a hot-oil treatment at home if you prefer, and you likely already have everything you need in your kitchen and bathroom. To start, blend together equal parts of olive and canola oil — three tablespoons or so of each should do it — and warm them in the microwave. You want the oil to be warm but comfortable to handle, not hot. Use your hands to apply the warm oil to damp hair, working it over every strand. Follow up with a wide-toothed comb for even coverage, if necessary. Wrap your hair with a warm towel or a shower cap and leave the oil on for 30 minutes, then rinse and follow up with a gentle shampoo. If you like, you can experiment with adding other oils to the mix.

Answer 1

The reason these oils seem to penetrate more is due to the irritation caused by Capsaicin.

Web MD Says:

When a capsaicin cream or ointment is used on the skin (topical use), capsaicin helps relieve pain. Capsaicin works by first stimulating and then decreasing the intensity of pain signals in the body. Although pain may at first increase, it usually decreases after the first use. Capsaicin stimulates the release of a compound believed to be involved in communicating pain between the nerves in the spinal cord and other parts of the body.

So while the oils feel like they are penetrating more I find no claims that it is actually absorbed by the skin at a greater rate.

Answer 2

From what I understand the rate of skin penetration by oils is determined by their viscosity, rather than anything to do with their temperature.

I could not find any studies testing the effect of temperature on skin penetration, nor anything to show why the practice of warming oils exists is common in some places. My guess is that applying warm oil may be considered to have other benefits such as helping the subject to relax.

I did find some studies that seemed to show a trend that the higher the viscosity of an oil the lower the absorption rate. However the only one I was able to access was this:

The results indicate that as viscosity increased in the range ca. 30 to 5000 cSt (base oil to residual aromatic extract) the uptake of the radiolabelled benzo(a)pyrene into blood was reduced by ca. fivefold. Further increases in viscosity from ca. 5000 to 69 × 106 cSt (i.e. residual aromatic extract to bitumen) resulted in a further but smaller (ca. twofold) reduction in uptake. The relationship between the amounts of free benzo(a)pyrene measured in blood and viscosity showed the same trend.

Source: Studies on the dermal and systemic bioavailability of polycyclic aromatic compounds in high viscosity oil products

This was also interesting:

The negative influence of liquid viscosity on penetration power through the skin has since long has been noted by many authors. : Brown & Scott 1934-Valette, Cavier & Savelle 1954- Hadgraft 1961.

In fact, some of our results meet their assertions: it is according to their very low viscosity that MINK OIL, Linseed Oil Carthame Oil are showing their penetration power, It is according to their heavy viscosity that Rice germs Oil and Celzaseed Oil have a very poor penetration power. Between these two extremes, we can establish a satisfying correlative between speed of penetration power and viscosity. Exceptions to these rules are.

-Soya Oil: low viscosity but still slow penetration -Avocado Oil: Higher viscosity but strong penetration

Source: COMPARISON STUDY BETWEEN DIFFERENT OILS ON BEHALF THEIR PENETRATION POWER INTO HUMAN SKIN

I find that page quite questionable however and am unable to find any other reference or copy of the study they claim is done in collaboration with the Laboratory Services of Chemistry and Bacteriology - City of Gent and the Belgium Ministry of Health.

If the rate of absorption is dependent on the viscosity of the oil, then warming an oil may make it less viscous but that may also remove or damage elements of the oil that you were hoping would be absorbed.