Have noticed on several times that when I went from Subaru OEM oil to Amsoil BACK to OEM that it runs much quieter and smoother on Amsoil.
But I run Amsoil signature blend in my vehicles. And I also push 15,000-25,000 miles per change.
I have seen my friends and family use amsoil for 25000kms each change and their cars do 200k- 300k without any engine issues.
I already added to engine oil and transmission. 5mpg improvement avg. already.
Switch to Amsoil products and go every 6,000. I honestly would go every 7500 with it if it was me driving that much.
Send your used oil to Blackstone or Amsoil for analysis and all of your questions about oil will be answered.
The best all rounder motor oils currently in the US are Pennzoil Ultra Platinum and Amsoil Signature, the latter you can run for at least 20k normal service or 15k extreme service.
Perhaps using a lower weight, full synthetic engine oil would build pressure faster and reduce the noise.
If you are using ToyotaCare, they will push 10k/1yr oil change interval. If you willing to pay for every oil change, they don't care.
The only thing I noticed that my 03 Camry burns more oil when I was obsessed with 95, im usin 91 now though its still burning oil but not as much as 95.
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