What you guys want to keep in mind is how your engine is wearing, that's the bottom line and why BG added an oil analysis sticky to this forum. Look at the levels of the first 6 metals in the Blackstone Labs report that is what you really need to know. The other metals and non-metals listed can be broken down into contaminants, like silicon, anti-wear addtives like Zinc and Phosphorous and detergents like Calcium that buffer acids and prevent corrosion. Aluminum, chromium, iron, copper, lead and tin are the building blocks of your motor and if you see sustained high levels of these metals in your reports something is wrong. A new or freshly rebuilt engine ALWAYS shows high wear rates of these 6 metals, each engine is different but they all follow the same pattern. As the engine breaks in, wear metals will gradually decrease and flatline. At the end of the engines life cycle, wear metals will begin to rise again. The pattern is like a very flattened out U. If you're seeing high aluminum, expect piston wear, high lead and tin, main bearing wear, copper, bushing wear, chromium is ring face, iron is bearing journals, cylinder walls etc......really comon sense if you know what your engine is made from. Oil has many functions in your engine, it cools, cleans, cushions, seals and lubricates. Most of engine wear is now known to occur during engine startup and that is why oil circulation at cold temps is important. Rotella 5W40 is very viscosity stable, I think the V.I. is around 190 which is very high. This means it will flow at extremely low temperatures but maintain film strength at very high temperatures. If you have a high mileage vehicle with worn hydraulic lifters, an oil like Rotella 5W40 may not be the best choice as lifter bleed down can occur on overnight shutdown. A thicker dino oil or "High Mileage" formula is better for worn engines. This is not a fault of the oil but a fault of the engine. Kind of like the old Casite "Motor Honey" oil thickeners used to stop ring blowby and smoking long enough to dump your car on some poor unsuspecting fool, using a higher viscosity oil masks the fact that your engine is wearing out. The Kawasaki automatic chain tensioner we have on the Zx-14 has a design flaw. It doesn't retain oil well after shutdown, a check valve would have solved this problem. This is analagous to the leaky lifter issue on high mileage cars. If you use a thicker oil like a 20W50 you are likely to have little or no chain rattle on startup but the oil is too thick to circulate well in the engine. The tensioner rattle on cold startup doesn't hurt anything, it'll do it for the next 100,000 miles.
Kruz
* Last updated by: Kruz on 8/14/2009 @ 7:49 AM *
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