Car vs motorcycle oil - Kawasaki Ninja 250R Forum
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post #1 of 2 (permalink) Old 08-30-2008, 04:39 PM Thread Starter
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Car vs motorcycle oil

I was doing some research on Motul v300 Factory Line oil, and happened to run accross this interesting article.

"Moly is often referred to as a friction modifier, but it is actually a solid metal dispersed in some oils. Because it has such a high melting temperature (4730 F versus 2795 F for iron), it works great as a high-temperature, high-pressure antiwear agent. Some claim that because moly is so slick, it can cause clutch slippage. In fact, some motorcycle manufacturers specify oil without moly due to this problem. The moly issue is such that Honda offers its HP4 both with and without it. Looking at the moly graph data, however, shows that even Honda's "moly-free" product contains 71 ppm. Many of the products contain less than five ppm of moly, which is the threshold measurement on this test (meaning any amount less than five ppm will not be detected). Both Torco oils contain a significant dose of moly, while the Maxum Ultra and Motul 300V Factory contain far less. The Mobil 1 automotive oil contains 92 ppm, while the MX4T motorcycle-specific version has an undetectable amount. Only six of the 19 motorcycle oils we tested use moly at all. Those that do, however, average 298 ppm. Considering that many oils contain five ppm or less, 298 ppm is a significant dose."

Acid Neutralizers
We charted the three most common additives (boron, calcium and magnesium) used to neutralize acids produced inside an engine during combustion. In this category, we can see that the car and bike oils are different in some cases. Every company seems to agree that some dosage of calcium is required. The highest amount is Amsoil at 4843 ppm, which explains its very high TBN of 14.42. Amsoil does not use significant dosages of either magnesium or boron, though; many other oils use both of these to bolster their acid-fighting ability. Maxum Ultra contains only 986 ppm of calcium, but supplements that with the highest dose of magnesium in the test at 1275 ppm. The Mobil MX4T product uses 699 ppm of magnesium and 221 ppm of boron. Another difference between the auto and bike products offered by Mobil is the use of magnesium. Mobil 1 automobile oil contains only 33 ppm of magnesium"
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post #2 of 2 (permalink) Old 09-30-2008, 02:22 PM
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So what's with the so called "molly-free" Honda HP4 having 71 PPM while most(14 oils out of 22 tested) of the other oils have 5 PPM or less... If the presence of molly in motorcycle oil is such an issue then why is the Honda product showing such a measurable amount of it while so many other products available have considerably less...? And why are they selling it as "molly-free" when in fact it contains significantly more then the other oils in this comparison...? I realize that 71 PPM is still a relatively low ratio in the scope of things but I'm not clear on the significance of this elements existence in motorcycle oil...

If Honda recommends a "molly-free" oil in it's engines then why are they selling a product marketed as "molly-free" when it contains much more then many other products available... Presumably Honda wants their power sports equipment customers to fill their toys with the factory recommended fluids...

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