I did a compression test on my 96 Miata, and was hoping I could get your take 
on the results.

This engine has 20 over 9:1 Wiseco pistons.

Dry, warmed up:

1 - 175    2 - 175    3 - 175    4 - 165

1 teaspoon oil in each cylinder, repeat compression test:

1 - 205    2 - 210    3 - 190    4 - 200

I am did this test because I am using a lot of oil. All spark plugs look great 
except #4 which has clumpy build up.

Any opinions on what ails this motor?/ What I should look for? 

Thanks...Steve
*************************
94-95 Link ECU
Eaton M45 @ 7.5lbs
440 cc injectors
dual feed rail
walbro pump
NGK ZFR7F-11 plugs
NGK blue wires
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