One should not risk it and there's no reason to. Simply measure the bolts length with a vernier or dial caliper. If the engine has never been apart before they will for sure be in spec, but don't take the risk.

As long as they are not over length, there is no risk whatever.

blueranger,

I'm sorry, I am in a bad habit of skimming these posts quickly. I thought you meant coolant in oil, not oil in coolant. I would go to a radiator shop and have them pressure test the cooling system first and tell you what they think.

It might be a leaky atf cooler or whatever. They usually don't charge to do this.

Good luck,