![]() ![]() Synthetic oil has better lubricity (or slipperiness) than petroleum-based oil, as well as several other advantages. On the other hand, multi-vis oil will strip off engine parts much more readily during periods of disuse, so it doesn’t provide nearly as good corrosion protection as single-grade oil does.įully synthetic oil such as Mobil AV-1 (no longer available) is a multi-vis synthetic oil with an AD additive package similar to other AD oils. This is a distinct advantage for cold weather starting if a preheat (or heated hangar) is not available. This oil remains much thinner and more easily pourable at room temperature than single-grade oil. ![]() Multi-Grade OilMulti-viscosity petroleum-base oil such as Phillips X/C 20W-50 is similar to single-grade AD oil, but has a viscosity index (“VI”) enhancer which causes the oil to maintain a more constant viscosity over a wide range of temperatures. When starting in sub-freezing temperatures, single-grade oil may be too thick to provide adequate lubrication in the first minute or two of engine operation. However, single-grade oil is not recommended for non-preheated cold weather operation. Single-grade oil is especially good at protecting engines against internal corrosion, because it is very thick at ordinary room temperature and sticks to engine parts without stripping off as readily as multi-grade oils. It offers good lubrication and good cleansing action. Single-grade AD oil such as Aeroshell W 100 (SAE 50) or W 80 (SAE 40) is a straight-weight petroleum-base oil with an additive package of ashless dispersant cleansers, lead scavenging agents, and acid neutralizers. If you use this stuff for break-in, you should plan to drain it within 10-25 hours (the sooner the better) and replace it with a high-quality ashless dispersant (AD) oil. Its “claim to fame” is that it isn’t particularly good at either lubricating or cleansing! The resulting high levels of friction may speed up the break-in process, but this oil isn’t approved for long-term use in your engine. It is commonly used as break-in oil for new steel or chrome cylinders. Single-Grade OilStraight mineral oil such as Aeroshell 100 (red can or blue plastic bottle) is a petroleum-base oil without the usual cleansing agents or additive package. Finding an oil that performs all of these functions adequately well can be a tricky business. The oil must also serve as a coolant, a cleanser, an acid neutralizer, a sealant, a hydraulic fluid, and a preservative. That’s because the oil in a piston engine is called upon to do a lot more than simply lubricate. End of story.īut when it comes to the piston engines that power our airplanes, the issues are much more complex. You’d simply choose the slipperiest, longest lasting lubricant you could find, and that would be a 100% synthetic oil. If you were flying behind a turbine engine, the choice of oil would be easy. ![]()
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