Your VR4 heavily modded?
Have not use NGK7 before but have tried Denso Iridium IK22 which is about NGK7 heat range. To me not much difference since my VR4 is standard stock engine. Currently using back NGK6 heat range only....
I drive the ae101 (21year old car) with stock 4afe engine. It was the family car before being passed over to me. In my hand, I bring the car for service/engine oil change every 5000km/every 3 months.
So the problem is: the engine oil level will drop till almost empty before 5000km service interval (less than 3 months). Have tried using different oil rating but still the same problem and recently realised the problem is worsening. Last time...
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