Caltex gasolines with Techron® have the added bonus of containing a powerful demulsifier which separates water and minimizes rust.
Combustion chamber deposit interference (CCDI) and combustion chamber deposit flaking (CCDF) are two problems which sometimes occur in certain modern engine designs.
CCDI is the result of physical contact between deposits on the piston top and the bottom of the cylinder head and is manifested as a loud, metallic banging sound when the engine is cold. CCDI is limited to the engines that have been designed primarily to reduce emissions, with minimal clearance—one millimeter or less—between some areas of the piston top and the cylinder head (squish areas) when the piston is at top dead center.
Combustion chamber deposit flaking causes low-compression pressure to result, due to improper sealing of the valves. This problem occurs when pieces of CCD flake off and end up lodged between the valve face and the valve seat. Typical symptoms of CCDF are difficulty in starting and rough running when cold.
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