Never have I had an engine problem using flush.
On joining Rolls Royce Quality Engineering Dept my allegiance to flush was shared by the Technical Head of the Oil Lab.
Engine Test Bed results proved this. Repeated cold starts and endurance tests 24/7 on other manufacturers engines was commonplace,with tight security.
Since leaving RR to form my own business I tried different flushes using a pedal pusher on the throttle set at fast idle.
Improvements in piston ring & valve sealing could cause the engine rpm to rise as compressions started to match raising efficiency. Also a compression test before and after could prove the benefit.
Forte constantly came out on top.
Commonsense dictated engines, which have been seriously neglected, flush was not to be used for fear of blocking the pump strainer/pipes etc.
As regards manufacturers not approving flush out,
I would suggest they have a vested interest in selling parts.
Regards Derek
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