1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Castrol GTX synthetic blend (Green bottle)?

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Old May 30, 2026 | 05:37 PM
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From: WarzWaldo
Castrol GTX synthetic blend (Green bottle)?

Is this an approved blend for the Rotary? I didn't realize there are multiple bottles that are alike and used the blend? What is the ash contend for the synthetic blend?
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Old May 31, 2026 | 08:23 AM
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Waffles - hmmm good
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From: Lake Wylie, N.C.
The synthetic will not burn as well and may leave more deposits. I'm using it but I added a Sohn adapter to inject 2 cycle ashless oil when I did use it.
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Old Jun 5, 2026 | 09:40 AM
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Is this a street car or a track car? Does your oil metering pump work properly? Synthetic oils in a system designed to inject it have been out there for a long time, but if you don't have a unique use case requiring it, regular petroleum oils work great with little hassle (*more frequent changes) and no problems. Rotary engine oiling isn't rocket science but you do need something that flows well and burns when injected into the combustion cycle - or you'll end up with unburned synthetic residue downstream, if that matters (*O2 sensor for SE, Cats if still installed for emissions, etc.).

No reason to reinvent the wheel,
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