Quote:
Originally Posted by The Kurgan
I was assured that doing the induction service every 40 or 50km is a good preventative measure to avoid the possibility of the need for walnut blasting.
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That is a 100% snake oil comment to liquidate you of hard earned cash. Those types of treatments (SeaFoam falls in there) work at removing some of the carbon deposits in the cylinder and on exhaust valves due to steam.
Walnut blasting removes carbon on the intake valves which is a result of oil vapor being sucked back into the intake as part of the PVC system.
Only true method of "preventive maintenance" to reduce the need for walnut blasting is the oil catch can.
It wouldn't surprise me of the bulk of the benefits you are experiencing was from the thermostat swap. Engine running at higher temps (specially if you have carbon build up) will introduce other negative artifacts (misfires, etc).