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Originally Posted by MNBoxster
Hi,
Nope - all 987's are susceptible. There is some talk that it's less frequent, but I don't believe it. The Seal is on it's 3rd or 4th Gen, and this has staved it off until later mileages are racked up it seems, but I think it's too early to say that the 987 won't experience this problem at the same rate as the 986.
They're all varaiants of the same basic engine design - M96/20 (2.5L), M96/21, 24 (3.2L), M96/22,23 (2.7L), M96/25 (2.7L 987), M96/26 (3.2L 987)...
Happy Motoring!... Jim'99
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Has anyone ever cracked open the early and later variants to see if there have been any changes made to the casting?
It's not out of the realm of possibility that the crank support bosses, seal mating area, etc.. have had running changes made to help prevent or eliminate the problem. They would still be classified as M96's, that's why they call them
variants.