[W126 Coupe] don't use high mileage oils

[Rockymiranti at aol.com]

I drive a 87 -560, with 253 K, this year I started using Silkolene 0w-20  and 
15w 50 in combo, the car just passed NJ emissions insp.I don't leak motor  
oil. The engine is using half a quart to the tank full. The valves are on the  
verge of being done. Last year I used 5w-50 Castrol full sync with some Marvel  
Mystery oil additive and before that Pinto 0w-40syn, it was night and day  
difference in engine smoothness. I also run the car in comp., mostly autocross,  
mechanics advise changing timing chain, I never did, they also suggested head 
 gasket, because of 'sweat' on the back of the no. 8 cylinder never did. I 
have  had to change valve cover gaskets almost every 30k, they leak like sieves, 
the  trans leaks but not the bottom end of the engine. A couple of years ago 
I  checked the compression and leak down in the cylinders, they were 
reasonable and  good,respectively.I like 0w-50 synthetic, I love  Silkoline.
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