My engine is about to break 100K and I want to do an engine flush. At 75K, I switched from dino oil to Mobil 1 5W-30 (synthetic). At 90K, I switch to Amsoil 5W-30 (synthetic). My question is, which way should I go: Amsoil engine flush or Auto-RX ? After I flush, I plan to fill up with Amsoil Series 2000 0W-30.

 

I vote NO to an engine flush. Just stay with religious Synthetic Oil Changes and your motor will last beyond forever....

-matt

 

If your gonna do one go with the AutoRX, though you will have to go back to conventional oil for a while, its really mild and won't break anything free to get stuck in an oil passage like those 5 minute flushes they sell.

 

Well, I hear a ticking sound from the engine and thought maybe this might help alleviate it. I don't mind going back to dino oil for a few thousand miles if it will help my engine run smoother and quieter in the long run.

 

my vote goes for Auto-RX

 

is't "ticking" caused by loose valves? If I'm correct oil additives will not solve the problem. (I hope I'm wrong)

 

If you do anything at all, do two Auto-RX cycles, given you are at 100K and follow the instructions to the T, ie. no short cuts. Run dino oil on the two rinse phases.

However, I question why you want to do anything at all.

I did an Auto-RX clean and rinse and switched to synthetic oil in February. My engine runs so quietly, I can't hear it at idle with the windows rolled up.

 

I don't hear it either when the windows are up. But hearing the tick when I'm standing in front of an open engine bay annoys/concerns me.

 

I got a weird result from auto-rx. After I used it and I was changing my oil the oil took a really long time to come out. Really really long time to come out.