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Old 06-13-2019, 05:49 PM
97 SL320 97 SL320 is offline
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Join Date: Jan 2012
Posts: 7,534
Quote:
Originally Posted by hbofinger View Post
Coolant has always been kept at the proper level. Overall she is in good shape. I will work those bolts slowly...
Proper level ( volume ) isn't the issue, having the coolant corrosion inhibitors at the proper % is the issue. Even then, coolant can slowly weep through gaskets then corrode bolts because the weeping coolant is trapped , loses corrosion inhibitors and does not get "renewed".

Be aware that coolant passages on the intake manifold and cylinder head may be pitted resulting in more work than anticipated.
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