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Done some reading here and there for awhile about oils, both synthetic and dino. I've seen Chrysler MS-6395 mentioned on some brands and not others. And I've seen it as MS-6395 with a letter after it also. What exactly does that mean? Obviously the oil meets Chrysler standards that list it, but does that mean don't use an oil that doesn't list MS-6395? And if an oil was used not meeting that standard, what are the risks? Engine damage, leaks, etc... I switched to a synthetic recently and are now finding some oil at the back of the pan, on the structural collar and bolts. And I looked at the oil jug and it doesn't mention MS-6395, so I'm hoping anyone with some knowledge of the Chrysler standard will chime in and educate me a little bit.
 

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Can't help you with the Chrysler standard but in my experience synthetic oil will get by some seals that standard oil will not.
 
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