Here’s a thought ……
Once you put the engine flush in, you are supposed to leave the engine to idle for a few (15) minutes to do its magic stuff.
I wonder how many technicians actually let the engine idle to its time scale when they are paid on their selling hours …?
I know my technicians would find it hard. The more work the cram in, the more they get paid.
Is the engine up to temperature when they start the flush process? Probably not for the same reason.
Does anyone have any evidence that an engine flush is improves engine performance or longevity?
Let’s assume they do it properly- engine up to temperature, idling for ? 15 minutes before doing the oil change. ( and I’d be concerned that if not done properly it may cause more harm than good- by loosening the deposits and leaving them in the system).
I’d be interested to do it if there is proven benefit
I think we're getting a bit to complicated now for a simple oil change...but let's continue what about adding a bit of Liqui Moly Cera Tec in to help reduce component wear which does have proven benefit behind it?
I'd assume the engine flush is just like throwing out a cold cup of tea, you empty it but there will still be a few drops in there and the flush is there to get those bits. But if your oil is thick and has metal fragments in it then you already have bigger issues.
So I too would be skeptical of an oil flush, mostly because we've seen old bmw's, merc's and volvos hit 1,000,000 miles and that was with just a simple oil change every 6-10k miles, no flushing, no additives, no octane boosters, not even premium fuel.
Just normal driving and consistent maintenance.
