ok let's settle this oil thing once and for all
a week or so ago there was a thread on petroleum based engine oils and synthectic. actually i think it started on oil additives.
i thought i had taken away the more popular belief was to use synthectic. i just had a mb source tell me they did not push the synthectic oil. they felt it could damage a seal and cause a leak.
they are right changing a compound touching a resilient seal can cause problems of either shrinking or swelling or loss of resiliency memory. i see it this quite often in the valve business.
let's talk about what everyone thinks on this topic.
i have 143k miles on my 420 and since i'm working on the valve train i'd like to know what everyone thinks before switching.
1972 350sl Red/Blk 117k
1988 420sel charcoal/Blk 140k
1987 420sel gold/tan 128k
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