Additives won't cure a cracked head.

The question is "how quick can you sell a car?"

Now is the time when unscrupulous sellers sell the car and claim to know nothing about any issues.

We could place wagers here... I say you can go 2K miles before euphoria gives out to cylinder pressures again.

Repeat this exercise, and you are coating the radiator passages and whole coolant system with internal coatings, and making the heat exchange less effective every step of they way. What was once a head-only issue will become a total engine write-off visa vis cooling system cloggage.

Get a new #14 head (cheap! I threw one out last week with a car) on it if you plan on keeping the car.

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Cheers!
Scott McPhee

1987 300D