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I was using Rotella for a while because my uncle had a diesel truck and he said that I could have all of the oil I wanted. It worked rather well even though IMHO I think that if you are changing your oil regularly enough, it wouldn't matter.
And yes, its true that motor oil will maintain its viscosity and not break down unless its put under the stress that exceeds normal daily driving. But changing the oil helps rid the engine of sludge, dirt, moisture, and everything else that gets collected in the engine.
From what I've read the Rotella HD is supposed to be some really good shit though I've never used it. Personally I like Royal Purple.
You have that backwards.. Cheap Dino oil is usually horrible for sludge build up. Ever engine I tear down that used dino oil is usually tarnished and sludged up. The reason Royal Purple starts looking bad after 2K is because it has good quality detergent in it and when used in older engines that previous used dino oil it begins to break the sludge down making the oil look nasty.
You have that backwards. Every engine I have even seen torn down with synth, (lets see...probably close to 500) has problem. The proof is in the pudding.
Synth sucks. I could give a shit about lab testings and etc, I just know what I have seen with my eyes.
R.I.P 07/01/09 - 04/23/10 :(
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