I've been using a 20W-50 Racing oil in my engine due to it having a higher concentration of ZDDP additive that is supposed to provide better protection for the valve lifters.
Here is what I copied off the web site. I happen to have a local dealer near my home, so it is easy for me to stop in a buy a case.
I have no idea what is available in your area.
PENNGRADE 1® PARTIAL SYNTHETIC HIGH PERFORMANCE OIL SAE 20W-50
PennGrade1® Multi-Grade High Performance Oils are specially formulated using high quality PennGrade base stocks and select additive technologies to meet the stringent lubricating demands of high-performance, highly stressed, street and racing engines.
PennGrade 1® Partial Synthetic High Performance Oils deliver excellent shock load and high temperature protection to heavily stressed engine parts including bearings, camshafts, rings, and pistons. They reduce internal friction for increased horsepower output while maintaining their strong lubricating film protection even under the most demanding torque and extreme temperature conditions. These high performance formulations also provide good anti-foaming and shear stability characteristics, excellent high temperature protection from thermal breakdown, outstanding film strength, and strong anti-wear properties.