One oil that seems to work from all the videos I've watched for cleaning varnish is the Valvoline Restore and Protect.
I use this on my Hyundai Elantra for the past 100k miles ... It's already at 200k and the engine still feels new ... I use Valvoline for everything including power steering ... Valvoline syn blend is a great oil option ...
Valvoline protect and restore has more detergents than any other I believe to clean out thew gunk. I've been running it in my car for 3 oil changes now.
I've seen lots of videos showing the Valvoline restore and protect oil helping to clean engines. If you go that route I'd recommend replacing the oil filter after 500 miles then again at 2500 miles to keep the filters new for any gunk that gets freed up.
Switch to Amsoil products and go every 6,000. I honestly would go every 7500 with it if it was me driving that much.
Use Valvoline Restore and Protect oil if possible
Valvoline full synthetic, 5w-20, She has 151k and counting.
Send your used oil to Blackstone or Amsoil for analysis and all of your questions about oil will be answered.
AmsOil 10w30 for turbo engines... haven't had any issues yet. Still consumes it though.
I do believe that Valvoline R and R can cause oil leaks. I have noticed that in a couple of cars.
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