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Hawker Pacific - Piston engine technical help

Blue Seal Technical Help
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Re:Oils - 2007/01/30 11:10

Expanding on my previous post where djpacro asked a question on the selection of oils.

If you have a normally aspirated engine that operates under ideal conditions - with constant use (every day or two) - in stable temperature zones - and is not a Lycoming 76 series engine, then you can use straight oil without any concerns.

If you don't use your engine constantly, but still operate a normally aspirated engine in stable temperature zones then you will need the corrosion preservatives and additives that a premium oil offers.

If you use a turbocharged engine, or operate in low or high temperature zones, then a multigrade oil would be your choice.
However some multigrade oils do not scavage lead too well, so if you do a lot of circuits or operate in full rich conditions, then perhaps a straight or premium oil will be better. As a guide, if your lead ppm in an oil analysis is above 4000, then I recommend against multigrade.

If you fly into a remote airstrip and cannot use the same oil that is in your engine then don’t be too concerned. It is a requirement that all oils are compatible with one another and all it will do is to dilute the synthetic portion and the additives within your oil.

Regarding Lycoming additive LW 16702, this was designed years ago for use with the straight oils. The advise given to me is instead of using this additive, use a premium oil that already contains all the necessary additives you need.

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Author

Date

Oils

djpacro

2007/01/23 12:46