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  1. M

    Switch from 5w30 to 10w40

    I want the definitive answer to whether it is okay to switch from the manufacturer recommended 5w30 to a 10w40 motor oil? I recently put a turbo on my 2006 Scion TC and plan on tracking the car, should I switch to 10w40? I'm sure this topic has been discussed several times, I've read that due...
  2. M

    Valvoline VR1 10w30 - 1219 mi - Scion TC

    2006 Scion tC TRD Supercharger Odometer: 144,314 miles Valvoline Racing Synthetic VR1 10w30 - SL formula WIX Air & Oil filter 10% street/ 90% freeway: 1129 miles HPDE Streets of Willow track day: 90 miles Total miles placed on oil: 1219 miles Recently installed an oil cooler on my car, should...
  3. M

    Is it okay to use 5w40 instead of 5w30?

    Is it okay to use 5w40 in my car that the manufacturer calls for 5w30? I'm so confused on the topic of switching to a higher weight oil. Ie. Tight Bearing clearance of today modern engines. The reason I want to try 5w40 is because I've noticed more oil consumption then normal but have no leaks...
  4. M

    Castrol Edge 5w30 UOA

    2006 Scion TC Castrol Edge 5w30 changed at 5000 miles. I drove 60+ miles everyday for work and two spirited driving runs through some canyon roads on this oil. This is the fifth oil change I've used Castrol Edge and I really like the way my car feels so I decided to send the Castrol Edge in for...
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