I have a few pages that I've texed. I wanted to start the document with a title page but if I do that it produces an empty page numbered '1' between the title page and the first section. How to prevent that? I tried document classes report, article and book, \maketitle as well as \begin{titlepage}/ \end{titlepage}.
 The code looks like this:

\documentclass{report}
\usepackage{amsmath}
\usepackage{amssymb}
\begin{document}
\textwidth 13cm
\title{Author: My title}
\author{a. name}
\maketitle
\hfill
\chapter{Chapter title}
\section{section title}
\end{document}


Thanks for your help.


Question: What are the reasons to mix oil & coolant?
Answer: It's not unusual for a second radiator to be present behind the main radiator, often to cool the transmission fluid.  If these fluids are mixing (water and transmission fluid), then both radiators have been damaged and are leaking their fluids together.  Both radiators will need to be removed and repaired.

Sometimes coolant will appear in engine oil because the head gasket has 'blown' or broken, allowing coolant to enter the cylinder or oil to enter the water jacket.  The repair is to remove the head and replace the head gasket.  

Sometimes the cause for mixed fluids is a cracked block, in which coolant and/or oil escapes the engine through the crack.  The repair is to replace the block because a cracked block cannot be repaired.  Normally you'll choose to replace the engine, since it's easier to swap the engine than disassemble an engine to swap its block.  Most people would just buy another car.

If your car HAS been in an accident, I would first try to identify the two fluids that are mixed.  Then I would check first for a cracked block, then check for broken radiators.  The third possibility, a blown head gasket, is unlikely to be caused by an accident.