About to change oil on TDI A4 with 112k miles and bought Morris Flushing Oil from small British company.
I have just read that this can cause harm to high milage engines so I think I will return this product.
What does Audi say about engine flushing?
Has anyone experienced problems after flushing?

 

I have personally used a motor flush on both high-, and low-mileage cars prior to changing the motor oil, for the last 2 decades. Toyotas, Opels, BMW's, Porsche's, Nissans, and now Audi. I have never had any issues with ANY of my cars... well, not related to oil-related, or motor-flush, anyway. Some of them have had mileage as high as 125,000 - 155,000miles. I am always careful to follow the printed instructions. Generally, remove enough iol so as not to overfill the crankcase. Let engine idle for 5-minutes. Pat head and rub tummy at same time... OK, not that last bit, but you understand.


I can't see where it'd hurt an older engine, unless it's because it's tend to loosen up gunky chunks of junk from nooks and crannys which could possibly lodge somewhere else and do badness to sensitive iternal parts. But, if that's your concern, I say 500 miles of light duty, and run another can of motor-flush through it, and some more new oil.

 

Audi doesnt recommend flushes. The problem with flushes on poorly maintained vehicles is that carbon can be broken loose and plug the oil filter pickup.