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Are you having problems with your 1999 Mazda B2500? Let our team of motoring experts keep you up to date with all of the latest 1999 Mazda B2500 issues & faults. We have gathered all of the most frequently asked questions and problems relating to the 1999 Mazda B2500 in one spot to help you decide if it's a smart buy.
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From what you have told us it would seem that it’s not the engine itself, the top-end has been rebuilt without solving the problem, and rebuilding the bottom-end is unlikely to fix it either. I would be looking at the places where oil and coolant could interchange, such as the intercooler, turbo etc.