Stephenfz6r
New Member
Hi John, I believe a decent mechanic will take the time to do a good job when changing oil so I would not label all mechanics as bad oil changers. But how would you know unless you asked. I worked at GM dealer a long time ago and I attained the Grandmaster level of mechanic and had loyal clientele that brought their vehicles to me long after the warranty expired. They trusted my work and saw the extra care I took fixing their vehicles. Even small thing like filling the oil filter with oil before installing it shows an extra level of professionalism. I always heated up the engine and let oil drain out while I attended to other things on the car. I'm sure there are other mechanics who take pride in their work and follow good practices such as these.Yabba Dabba Dooooooo......
To me the greatest risk to the engine from the suspended oil particles is at the pump when it pressurizes the crankshaft. The tolerance at the main bearings is usually 1000th of an inch compared to 3-5000th of an inch at the piston and cylinder interface. The gearbox gets secondary oiling from the largest gear or balancer picking up oil from the pan. The oil pump itself is at risk as even a small amount of wear reduces oil pressure.
There no doubt that clean oil is a good thing and if you are doing a hard break-in like racers do then keeping it extra clean certainly minimizes damage. I always noticed some amount of fine metal particles in oil whether vehicles were new or old so it always seems to be be present. I work at an airline now and we analyze oil in our ground fleet and there are parameters for how much metal is tolerable.
Anyway I think we have beat this topic to death now. Cheers:surrender: