Jan 27, 2005. #1. If you want engine longevity, even though its not a BMW recommendation (but BMW doesn’t say its deleterious either), switch to a 5W-50 or 15W-50 synthetic engine oil as the higher viscosity (thickness) oil will keep the moving parts separated, albeit with the consumption of a smidgen more fuel. On the last (annual) oil change, I put 10W-40 in, and it puffs a little smoke each time I rev the motor from idle to running speed. Unlike a pump-fed car's lubrication system, small lawnmower engines are lubricated by splashing oil with a dipper connected to the crankshaft. Consequently, it doesn't hurt to run SAE-30 or SAE-40 oil, even in cold
So 5W-40 and 15W-40 both fall within the 40 range when hot, but 5W-40 is thicker than 5W-30 when hot. When the ranges denoted by the numbers, oils can vary in viscosity. For example, Mobil 1 5W-30 is thinner when hot than most other 5W-30 oils. For practical purposes, recent VWs recommend 5W-40 oil. For TDI engines through 2003 in the US, the
For 4-stroke engines Castrol POWER1 4T 10W with Power Release Technology™ optimises friction which in return provides motorcycle enthusiasts with a superior acceleration at the twist of the throttle. Castrol POWER1 4T 15W-20W with Power Sustain Technology™ manages heat and friction in bikes, ensuring continuous power delivery through its
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Thin, low viscosity oils flow easier to protect engine parts at cold temperatures. The faster oil flows to critical parts of the engine, the more protected they are from wear. So a 5W-30 will flow easier than a 10W-30 at start-up temperatures. And a 10W-30 will flow easier than a 15W-40 at normal engine operating temperatures.
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    • difference between 10w and 15w oil