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You need a better compression tester. A turbo should have a minimum of 155psi to a perfect 187psi, and all 5 within 10psi of each other. Less than 100psi would result in no burning of fuel.
You should also be using a minimum of 89 octane, preferably 91-91 octane. If you drive like a little old lady, stop doing that! The turbo engine NEEDS to spin rapidly, over 2K to keep the valves clean.
If you are not using 5/10W30 synthetic with a Mann or OEM filter, then do so at your next oil change.
Don't rely on aftermarket engine cleaners to keep your engine occasionally clean, treat it nicely every day with good oil, gas, and spirited driving.
Klaus
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Proud owner of a 220S. If I had more room, I would have more Volvos.
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