Recommended engine oil for W187 and W188?

[fj76]

Hello,
I would like to know what is the ideal engine oil for the W187(newly rebuilt engine) and W188(over 50k miles). Since the original SAE20 is difficult to find, would 20w50 be better or SAE30?

Thanks.

[John Ellis]

10W40 or 20W50 depending upon your climate.

[fj76]

Thanks

[PPATEL]

Would someone be kind to help give me some technical recommendations please... I have just had my engine fully rebuilt. looking for suggestion on whether to use Full Synthetic 10W-40 or other recommendation with viscosity or traditional mineral oil. Thanks in advance.

[Scott Montoney]

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.

[PPATEL]

Thank you Scott, will look to order it on the net. Really appreciate your advice.