quote:
Originally posted by CBDFrontier06:
A mechanic in the GM shop I worked at warned me against oil additives, and shared a personal experience he has with a customer's car. It was in Wyoming in January, if that gives you any idea of the temperature. (BRRRRR). The braniac customer just dumped a bottle of STP oil treatment into the car, got in and started it. About 5 seconds later, oil pressure (normally very high at cold startup) dropped to 0, the idiot light came on and the damage was done. After removing the pan, my friend found a brown 'glob' all over the pickup screen, extending up inside the pickup tube. The moral of his story was that if you insist on using an oil additive, warm up the additive, warm up the engine and if possible, drizzle it in slowly while the engine is idling. IMO, cold temperatures and viscosity improvers don't mix.