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[QUOTE="DougRoost, post: 669773, member: 23019"] Sorry if I passed along less than accurate info. Got it from a pretty knowledgable guy on another forum and he does note below the 15-25% by weight spec you pointed out. Here was the bulk of that post in case I interpreted it wrong: In comparing the MSDS of both the Mobil 1 and Amsoil TCR 2000, there are some differences. Here is the Amsoil: TYPICAL TECHNICAL PROPERTIES SERIES 2000 SYNTHETIC 2-CYCLE OIL (TCR) Kinematic Viscosity @ 100°C, cSt (ASTM D445) 8.3 Kinematic Viscosity @ 40°C, cSt (ASTM D-445) 51.02 Viscosity Index (ASTM D2270) 139 Pour Point, °C (°F) (ASTM D97) -42(-44) Flash Point, °C (°F) (ASTM D92) 110(230) Color Red SAE Miscability/Fluidity Grade 4 And the Mobil: Viscosity @ 100°C, cSt 13.7 Viscosity @ 40°C, cSt 91.4 Pour Point, °C (°F) -42(-44) (same) Flash Point, °C (°F) (ASTM D93) 76(169) Color Amber Kerosene 15-25% by wt. So what does it mean? Even though the Mobil is thicker in viscosity it's flash point is much lower than the Amsoil due to the kerosene content. While the Mobil 1 is burning away, the Amsoil will still be oil vapor. The kerosene is also lowering the pour point as mentioned above, but unless you are at the winter X-Games with an oil injected bike, low pour points are unimportant. Pour points become irrelevant when the oil is mixed with the gasoline. As far as the comment goes about kerosene being a mixing agent, that is true. But if you need a mix agent because the oil will not dissolve in the gas, you need another oil. In addition, I'll take Toluol over kero as a blend agent any day, and get an octane boost along with it. Both Mobil 1 and AMSoil are hydrocarbon derivatives here (I'm leaving bean oils out in this discussion). Some are "designer genes", (truly man made molecules) but many synthetics are simply highly refined petroleum basestocks (PAO's in the group IV catagory reference below for a spec sheet and tech data ), with an additive package. It is the additive package that truly makes an oil. The oils ability to lubricate under heat and pressure is a basestock function, while the additive package keeps the engine clean, and helps the oil flow when cold. Given these two choices, I would pick Amsoil for mixing with race gas in a racing effort, and run the Mobil if I was using pump and pleasure riding, to help clean up the trash left behind from the pump fuel. As I originally stated, Mobil 1 isn't horrible it's just that there are some better oils. Also, do not fall prey to the "less oil is better" attitude. Too much data has been collected about 40:1, 50:1, and higher having less power, and more engine wear. The guys running as high as 100:1 with their mix will have issues down the road. Lets say for the sake of discussion that the bike is designed to run on a 32:1 mix. The jets will be sized approximately for this mix. If you began to mix at double that, say 64:1 (one half the amount of oil) , you will wind up rejetting leaner for the increase in gasoline introduced into the engine. When you jet leaner to compensate for that, you will again be DECREASING the amount of oil also. Of course you will get rid of spooge somewhere along the way, but you will be running hotter, and shortening the life of pistons, rings, cylinders, etc. and probably be getting less performance also. For the AMSoil, I would stay with the recommended ratio from them. With the Mobil, info is available and validated that it performs better at lower ratios in the area of 25:1, again because of its dilution with kerosene. In either event, it is not wise to cut back on oil. A.Graham Bell, in the book "Two Stroke Performance Tuning validates this , and he is one of the leading experts on 2 strokes. In reply to the comment of getting whatever looked good at the shop, I had a 1976 Yamaha DT 175 that I ran 2 stroke boat oil in, both on and off road, for 6000 plus miles. I sold it with the original top end in it too. I agree that you can abuse a lot of things in life and get away with it. But with as much money as is invested in a bike as you or I have, why skimp on oil? Plus, my peace of mind when riding is worth every penny I spend on race fuel and oil to protect the engine, just as it is on equipment to protect me. One last thought. Mobil 1 comes in 16 oz. bottles, so, 8 of those make 1 gallon of oil. At 3.50 for 16 oz., times 8 is 28.00. Now 28.00 a gallon for oil isn't bad, but at 25% kero, you just paid a whopping 7.00 for a quart of kerosene. Think it over.... [/QUOTE]
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Dirt Bike Discussions By Brand
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2 stroke questions
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