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Old 01-18-2013, 12:03 AM   #8
OEM ///Member
Join Date: Dec 2004
Location: Brisbane, Australia
Posts: 2,271
My Ride: 1990 E30 318is
In the really old days (read 1969) Mazda did have trouble holding compression in their very early 10A engines (L10A and L10B Cosmos R100s).

But, materials these days are exceptional and you can even get lifetime warranties on some apex seals. Side seals can be an issue if they are not cut EXACTLY right but otherwise they can make very good power and hold it for many years trouble free.
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