An oil change: Sounds simple, but there’s some important things to know about preventing oil sludge. Oil eventually starts to turn into jelly. Literally – petroleum jelly. Sludge clogs up oil passages and keeps oil from getting to some areas of the engine, causing parts to wear out prematurely.
All engines have either a timing belt or a timing chain to synchronize the opening and closing of the intake and exhaust valves. This keeps the engine running smoothly and efficiently. If the timing is off, it may not run at all. Timing belts need to be replaced on a schedule. A broken or slipping timing belt could cause extensive engine damage.