My 2001 A4 is driving me crazy. It’s only about 60 000 miles (90k kms), I bought the car 5 months ago and here is the history:

1. As soon as I bought the car, I changed oil (Castrol Syntec 5W40, Group 3 synthetic) and drove about 3k miles, tapping noise was there whether cold or hot engine, a little bit better when hot

2. Then I did Pro-Line (Liqui-Moly) Engine Flush and switched to Liqui-Moly 5W40 full synthetic (Group 4 or 5, not sure) and drove 3k miles again, I noticed that as I was approaching 3k miles since last OCI, the tapping noise was almost disappearing when the engine was hot, but it was still present

3. Then I made a stupid decision, because Liqui-Moly oil can take another 3K (6k total) before having to change it, but I ran
seafom for 20 min (idling), drained the oil and put 1qt of Rislone + 3qt of Castrol Syntec 5W40 again because Rislone apparently cannot be used with full synthetics. Rislone is supposed to help with sticky lifters.

Oh man, the noise has never been higher, like I have water instead of oil. I have driven 200 miles so far with this combination and it’s really bad. I was hoping that 200 miles should be enough for Rislone to start working, but nothing.

In my desperation to do something, I bought Castrol Syntec European 0W30 (Group 4) and getting ready to dump the 200 miles old oil/Rislone, but what a waste.

Now, what to do next?
1. Dump the oil and put CS 0W30
2. Same as 1) but with something else, like Marvel Mystery Oil
3. I know, changing lifters would do the job, or maybe not, but $$$
4. ???

 

royal purple

 

You mean their oil? What weight?

 

yeah sorry that was from my phone um i run 5w 30 during the winter and 10w 30 in the summer
it works numbers and i change mine every 4000 and it is still purple when it comes out

 

Dont ever buy royal purple at all everyone know's on this forum its snake oil bad!

 

are you kiding me i love that stuff and motul
when i can find it

 

run 5w 30 mobile 1 oil

 

Yea, now after 100 miles on German Castrol 0W30, when driving for about 15 mins, instead of
tick-tick-tick-tick-tick-tick-tick-tick-tick-tick-tick-tick-
I hear
tick-tick-tick--------tick-tick-tick--------tick-tick-tick-------- and it's
quieter, actually when I am in the car, I don't hear ticking much, it's when I get out.

Will see in 1-2k.

 

No, it's gone when the engine gets hot - no more!!! I assume it's the GC 0W30.

 

5w-30 castrol syntec fully synthetic all the way