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Old 12-03-2009, 09:23 AM   #31
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Quote:
Originally Posted by jk'n View Post
Who will pay for your new engine when common sense seizes it up?
Are you saying that oil passage sizing in the 3.8 is so critical that the difference between a 0W-30 (10.3 centistokes @ 100 degrees C) vs a 0W-20 (9.0 centistokes @ 100 degrees C) will seize your engine? What about at 40 degrees C when the 0W-20 is at 50 centistokes? Why doesn't the engine seize then? Also, 20W is about the widest viscosity range there is on the charts. I have a hard time believing that engineers would design an engine with (supposedly) such critical oil viscosity requirements then specify an oil with such a broad viscosity range. Doesn't add up...

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Old 12-03-2009, 09:32 AM   #32
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I had an employee that put 10w-40 oil into one of my Crown Vics; 10w-30 was the specified oil. He was an old-school wrench-head and did it out of "common sense" ---- but hadn't read the Ford TSB about the oil galleys...
The oil couldn't flow fast enough and backed up in the most vulnerable place, the oil filter, which exploded. This employee was also a neighbor of mine and the filter exploded in front of my house.

I don't know how critical the issue is with the 3.8. I just know that it doesn't cost me extra to run the 20, it's specified in the manual, and it makes sense to adhere to the specification...

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Old 12-03-2009, 11:30 AM   #33
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HERE'S WHAT I RECALL FROM CLASS
Oil viscosity is selected, in most cases, on two combined points:
-Environmental temperature
-Vehicle usage

The low viscosity oils (0-20) are perfect for cold weather, average driving use. Its thinner, so makes turning over the vehicle easier. Acts like 0 when it starts, acts like 20 when its warm.

If you're in Florida, it's a long hot summer, and you're racing your vehicle regularly, you'd want a 5, 10-40. The heavier viscosity is designed to offset the engine needs at high operating temps and prevent friction burn-off. Essentially, the heavier oil stays viscose longer at the high temps.

That's about all I remember from mechanics class.

If you're not racing it, you won't go wrong with lower SAE oils. Most people can't put the continuous use on the engine that would require the higher weights.
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Old 09-26-2012, 02:31 AM   #34
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i us in my other car and 4 wheeler.the 4 wheeler would be so hot it would mburn the indie of your legs. now with amsoil it it not near as hot and will not burn you.i use it also in my gas ine nothing but amsoil 5w-20 100% synthetic.i do know one thing it will make your engine run a great deal cooler.i have seen the difference in my chain saw also.it never shuts down from over heating.i use the amsoil bar and chain oil.i had rather pay a little more knowing my vehicles will run much better

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