What is the best rear main seal and where to get?

I read on brickboards that there are 2 types. "There are two rear seals available: one is 10mm thick (red: silicone) and the other (grey or brown: Viton) is 7mm. The more expensive Viton will last much longer than the silicone rubber material.The 10mm is stock and the 7mm is replacement. Why? Because the original 10mm seal wore a tiny groove in the crankshaft after thousands of miles of driving."
I can only find the "Elring" brand from both IPD and fcp groton, which appears to be a "rust" color. Is elring the "viton" kind? Anyone?

-And just to be 100% positive, I do NOT have a flame trap on my 92 940 turbo, correct? I cant afford to go through another seal due to a crankcase pressure issue. Any crank seal left for many miles can groove the crankshaft. Dirt can get between the crank and seal and grind away the metal. When this happens, the seal can be placed ahead or behind the grooved postion of the crankshaft where it is smooth and will seal better.

Not to argue about silicone or Viton, the real reason why a seal will last longer is whether it has some long wear lubricant on it, not as much a property of the material. When you buy the seal from Volvo, it is the gray Viton and has a sticky black paste lubricant on it (or at least they came that way at some point) I haven't seen this lube anywhere else, and know it stays put to lubricate the seal during it's life, whereas a plain grease will eventually migrate away or wash away with engine oil.

Also Viton is a supreior elastomer for oil seals compared to silicone (red, rust). Viton can come in many different colors, black, gray, brown. Viton is a perflouro-elastomer, meaning it is a teflon containing carbon polymer and has great temperature stability as well as chemical resistance. It's worth the cost.

2.  PRESSURE: Oil Seals cannot endure a lot of pressure. You need to understand your machinery&#;s pressure capabilities and ensure you use the correct seal to withstand its pressure levels.

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3.  TEMPERATURE: Similar to the pressure level, you need to know what temperature your machinery can operate at. You need to choose a seal that can withstand the heat or cold. PTFE have the widest rang of temperature, making them a safe option when you are uncertain of the range.

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4.  SHAFT SPEED: As different shafts move at different speeds you need to consider the runout, the housing bore, and oil type being sealed. Ensure you select a seal that will not suffer from abrasions or spiralling.

5.  TYPES OF FLUID: Numerous oil seals can interact with oils, fuels, grease, water and more. However, know exactly what type of fluid the rotary shaft seal will be in contact with will ensure the longevity of the seal and the machinery.

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