15% is a fair amount, but seems a bit at odds with a 200 psi reading.
Oil through the guides may not show up with either test.
It was a long time ago, but the seals I bought were from Silver Seal and are/were blue in color.
I can look for the box - I kept it as I had to buy a bunch - and I may have enough left that I could send you some.
Im going off memory.
But best I can think most were in the 7-8 % loss. and maybe 2 or 3 were a little over 10% , Again been a while so I'm not 100% certain of those numbers. After i thought about it I dont think any were in the 15% range
But I do remember all 8 were in the low 200psi range on a compression ck
I went thru the valves right after I bought it and ckd the valve seals at that time and all were present and best I could tell still very pliable. Sorry,,,,but I dont remember what type seals are on it
Whats real odd. This past spring when I changed the oil ( I run straight 30 weight Rotella with a bottle of Lucas ZDDP additive )
And I ran it to Phoenix and back and oil was still on full. Thats about 300 miles round trip give or take.
Its after it gets maybe 400-500 ( approx ) miles on it, it will use a qt every 100-150 miles.
