- Joined
- Dec 29, 2021
- Messages
- 2
As the thread title says, just wondering if mixing a Si-Hoat with a P-Hoat would cause any outstanding issues? I am planning on draining as much as I can, but don't have time for a full flush at the moment. Vehicle in question is an 86 Rx-7, which I thought at the time required Motorcraft Gold but later learned should have been Fl-22.