You can top up with TTS if you've been using GN2. Semi-synthetics and fully synthetics mix no problem. You cannot however mix synthetics with castor based oils such as A747 or HTX.

As bushman says, if you're worried about diluting the TTS too much by just topping up, just pull the main feed off the pump and drain as much as you can, then top off with TTS. You'll be on 100% TTS then within 25 miles or so.
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Andy.
NSR-WORLD.COM

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