My Corolla has some varnish on the top end that I can see via the oil fill cap. I got the car with approximately 48K miles and it's now at 60K. I am on my second oil change and will be soon doing the third. For the first two OCI's, I used 15-20% MMO and it looks to be helping. I have a leftover gallon of T5 from the truck I just sold. I was thinking of running this for the summer to help clean the engine. The T5 seems to be a lighter HDEO that still is robust and had lots of detergent.
Any thoughts?
Any thoughts?