ronnie993tt

So am I reading this correctly.....the regular M1 15w -50 now available had the highest ZDDP levels @ 1387?

No HTwo O

Not correct. My first two oil analysis were done on Mobil 1 15W50 Ext. Perf. (gold cap). This oil is no longer available in the 15W50.

The 3rd test was done on my current fill with Mobil 1 Twin 1 20W50.

ronnie993tt

So I'm sure this won't help at all, but I called tech help at Esso (1-800-268-3183) and he indicated the
M1 15w - 50 has 1,200 ppm ZDDP and the M1 V Twin 20w - 50 has 1,600 however, he said that the motorcycle oil was not api rated for cars and they did not recommend it even for air cooled engines. I didn't really understand the reason other than it just has not been tested for autos. I wonder about a blend of the two!?

Kevin

Ronnie, your tech at Esso is not up to date with what the Mobil techs are putting into print!

The most important difference between a motorcycle formulation and an automotive formulation is that the automotive oils contain friction modifiers for improved fuel economy. Frankly, you are using 50 grade oil, you are probably not looking for fuel economy. So as you can see using the motorcycle oil in your vehicle is not an issue. Comparing the two oils, the main point of differentiation, beyond the motorcycle needs, is the level of ZDDP antiwear additive. Either product offers a robust level of antiwear with 15W-50 @ 1200 ppm phosphorus compared to the 20W-50 @ 1600 ppm

Another answer> please note that this reply means that 20W50 has special additives to prevent viscocity breakdown

Motorcycle oils and passenger car oils are very similar, with the exception of a couple of areas that are key to motorcycle operation. The first area concerns common sumps, or the use of motor oil, to lubricate and cool the transmission. As you know, in a passenger car the transmission is lubricated by an ATF fluid, which has frictional properties required for transmission operation. In a motorcycle, where the transmission may be lubricated by the engine oil, an engine oil that does not have the same level of friction modification (for fuel economy) of a typical passenger car engine oil will provide better transmission performance in terms of transmission lock-up and slippage. So motorcycle engine oil does not contain the friction modifiers of a passenger car engine oil. The second area of concern for motorcycle engine oils is that they tend to shear (breakdown viscosity) more quickly than a typical passenger car. Mobil 1 motorcycle oils are designed to provide exceptional protection against viscosity loss.

ronnie993tt

Thanks Kevin. I think I'm understanding this better now. So bottom line, the motorcycle oil will be a bit better for valve guide wear, etc., particularly in track applications but not as good for mileage? Regarding mileage - if I cared I certainly wouldn't own a 993tt! Ronnie.

Kevin

Not just the valve guides, but the rocker to camshaft lobe surfaces, thrust bearings, gears, and timing chains.

No HTwo O

I just wanted to update this post again. I received my 4th Blackstone Lab used oil analysis this week, and the report was excellent. My wear metals continue to decrease and improve. This was after my 3rd oil change with the Mobil 1 V-Twin 20W50. 5,000 mile intervals. About 12 months involved. All wear metals below universal averages. Zinc and Phos. levels excellent.

If anyone wants to see the full report, send me a PM with you e-mail address.

Thanks again, Kevin, for the sound advice.

fredcalero

Thanks for posting the results of your oil analysis. I have been using V-Twin for over 3 years now and happy to know it was good advice when it was first recommended to me.