ezrider
Again, may not apply to your engine but with a 616 or 617 those little o rings being "head" would not have that large of effect on the system. I think they might be giving you a load of crapola. maybe the other guys with your model car will know but it sounds fishy to me. I have seen them so hard they just crumble when touched and nobody changes them every oil change. Ask them to show you in your owners manual 
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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug
"Lifes too short to drive a boring car"
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