Good Evening
I have a well used, but much loved 98 Toyota truck with 2.4 liter 4 cylinder. I have run Amsoil 5 w 30 and factory oil filters for the last 200 k miles, changing the oil yearly and the filter every 6 months. I have a new job that is 3 miles from home. The engine never warms up, and, I am worried about moisture and sludge building up in the Amsoil. I want to switch to a cheaper oil and change oil and filter every 4 months or 2000 miles to dump any accumulated water and crud.
Any suggestions as to a good motor oil for short trips? I was wondering if switching to another synthetic would cause seal problems such as leakage?
THANKS IN ADVANCE FOR ANY INPUT