Oil seals - is there any practical difference...

Rubber coatings tend to harden or even shrink over time. They are easier to press in with less effort because the rubber deforms, I can often push them in with my bare hands. The rubber coated versions seal better in spots that have some corrosion, scratches, oil sludge, carbon buildup etc. I prefer this style for replacement when the engine or transmission is not disassembled, washed or being unable to use a proper seal driver or press.
Meatal clad seals are the stronger longer lasting version, they are less likely to pop out and seal better against the case by a stronger interference fit with the drawback of metal corrosion or dissimilar metal reactions if the seal coating is damaged. You should use a properly sized installation driver or press to install these straight and to the correct depth without distorting the seals outward metal face or the sealing lip will be distorted.
Some like to use sealants, I do not because the sealant may not bond to the case or the seal creating a leak, the sealant may not expand/contract at the same rate as the rubber or metal seals exterior causing a leak or even seal movement/looseness/dislodging. Lock tite for seals may be used to help overcome case damage or bore size irregularities to the available seals, thankfully I have not yet needed to use this personally...but life throws curveballs at every at bat it seems.

Goto Dingtong to know more.

The numbers on an oil seal, also known as a shaft seal or rotary seal, provide important information about its dimensions, material, and design specifications. Understanding these numbers is crucial when selecting the right oil seal for a specific application. Here's a breakdown of the typical numbering system used for oil seals:

Shaft Diameter (ID or Inner Diameter):

The first set of numbers usually represents the shaft diameter or the inner diameter (ID) of the oil seal. This measurement is critical because it indicates the size of the shaft around which the oil seal will be installed. For example, if the number is 25, it signifies that the oil seal is designed for a shaft with a 25-millimeter diameter.

Housing Bore Diameter (OD or Outer Diameter):

The second set of numbers corresponds to the housing bore diameter or the outer diameter (OD) of the oil seal. This measurement is crucial as it indicates the size of the bore or cavity in the housing where the oil seal will be placed. For example, if the number is 40, it means the oil seal is designed to fit into a bore with a 40-millimeter diameter.

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Width (W):

The third set of numbers or letter represents the width of the oil seal. It specifies the radial dimension of the seal, indicating how thick or wide the oil seal is. For example, if the number is 7, it means the oil seal has a width of 7 millimeters.

Lip Type or Designation:

Some oil seals may have additional letters or codes indicating the lip type or special design features. These codes specify the sealing lip material, configuration, or any special features that the oil seal may have. Common lip types include single lip (S), double lip (D), and triple lip (T).

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Material Code:

In certain numbering systems, a letter or code may be used to indicate the material composition of the oil seal. Different materials may be chosen based on factors like temperature resistance, chemical compatibility, and application requirements.

For example, if you have an oil seal with the number "25-40-7," it can be interpreted as follows:

Inner Diameter (ID): 25 millimeters

Outer Diameter (OD): 40 millimeters

Width: 7 millimeters

Understanding these numbers is crucial when replacing or specifying oil seals for machinery or equipment. It ensures compatibility with the shaft and housing dimensions and helps maintain effective sealing performance. When in doubt, it's recommended to refer to the manufacturer's documentation or consult with a supplier to ensure the correct oil seal is selected for the intended application.

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