This is from one of the MANY oil threads. I use Mobil1 15w50
"I agree with Morley - the key issue is the amount of anti wear additives to protect the camshaft lobes.
The Mobil 1 website states: "Mobil 1 15W-50 is formulated with SuperSyn, an extra high-viscosity synthetic fluid, plus extra anti-wear additive to provide extra protection for severe service applications. Mobil 1 15W-50 is recommended for high performance vehicles including turbocharged and supercharged engines where a thicker oil film is desired. Mobil 1 15W-50 is also recommended for older valve train designs that may benefit from a higher level of anti-wear normally not required for newer generation vehicles. Mobil 1 15W-50 will also provide better anti-wear protection for higher valve spring tensions in certain racing engines."
A Virgin Oil Analysis (VOA) indicated the following:
Silicon: M1 15W-50: 9ppm
Boron: M1 15W-50: 228ppm
Sodium: M1 15W-50: 13ppm
Magnesium: M1 15W-50: 43ppm
Calcium: M1 15W-50: 2464ppm
Phosphorus: M1 15W-50: 1193ppm
Zinc: M1 15W-50: 1315ppm
Molybdenum: M1 15W-50: 90ppm
The 1315 ppm of Zinc and 1193 ppm of phosphorus are the key numbers which indicates it has lots of anti wear additive.
For comparison BelRay EXL 20w50 (non synthetic SG rated) has 1151 ppm zinc and 1042 ppm phosphorus.
The Mobil 1 15w50 looks good to me"
15w 50 looks good to ME...
And if you feel the need for motorcycle oil this is from the Mobil1 web page
Is Mobil 1 Suitable for a BMW Motorcycle?
There is always lively debate on BMW motorcycle message boards regarding which brand and weight of motor oil should be used. Can you recommend Mobil 1 motor oil for a 2003 BMW K1200GT? BMW recommends an HD oil with API classification SF, SG, or SH. Bike has separate gearbox (SAE 90 GL5), and is ridden generally above 45°F with oil changes every 6000 miles? Thanks!
-- Patrick Maguire, Westminster, CO
We offer Mobil 1™ V-Twin 20W-50 motorcycle oil which meets the performance requirements of API SG and SH. Mobil 1 V-Twin 20W-50 is an advanced performance, full synthetic four-stroke motorcycle oil designed to provide unsurpassed outstanding levels of performance demanded by today’s high performance motorcycles. We do recommend checking your owner’s manual for the appropriate viscosity."