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Message: [QUOTE="sonic blue l, post: 1070632, member: 5185"] You want the facts, the reading of the compression test. What were the manual compression readings? Take a brand new engine, it will pass relative compression even, manual reading of approx. 380 psi. Take a dusted engine, it will pass relative compression evenly, it will also read even at say 150 psi. 150 psi will not support combustion. You should be above 350 psi, absolute min would be 300 psi. Anything below 350 and id be concerned. Now if they cant give you an exact reading they are full of ****. I will not do a manual compression test under normal diesel diag, as it would be an extra charge. You need a actual reading of manual compression before you know whether its worth while to isolate the turbos. If the truck has had multiple turbos and has high crankcase pressure, I would be concerned. There is no reason you should be replacing multiple turbos, unless someone is shoving sticks into them, running Mazola oil instead of engine oil, etc. If compression is good, then you would go to the turbo isolation root, if not, then you need to find out why compression is low. [/QUOTE]

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