e-tec oils xd50 xd100

28 Aug

(this post is work in progress – do not rely on this to make decisions about your own engine)

Update Aug. 2016: This season the engine has been running on xd100 oil with the xd50 setting. Hasn´t blown up yet.

The Evinrude e-tec uses direct oil injection, similar to other modern two-strokes like the Mercury Optimax (they are also similar in using direct fuel injection, though injection pressure is different).

The e-tec can use both the xd50 semisynthetic and xd100 synthetic oils. The former is a standard two stroke oil compliant with the TC-W3 specification, the bread and butter of two stroke oils.

The xd100 is synthetic and allows the e-tec to run on a leaner setting, and it´s probably also less smelly in its own right.

Essentially, then:

Setting: “xd50”: you can use the xd50 oil or the xd100 oil

Setting: “xd100”: you can only use the xd100 oil

I am trying to figure out if you can mix the two, e.g. when going from xd50 to xd100, is it ok to have a small amount of xd50 left in the tank; it seems you can simply run the xd50 low in the tank and fill up with xd100.

For cold weather, 5 deg Centigrade and less, xd100 seems to be recommended.

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