Posted by Bob M on May 20, 2009 at 10:50:50 from (151.190.254.108):
In Reply to: 2-cycle oil posted by Dellbertt on May 20, 2009 at 05:25:40:
Most any oil will lube a 2 stroke engine. Problem with detergent and multi-vis oils is the metal salts and other stuff in the detergents/VI improvers causes conductive deposits to accumulate on the spark plug insulator. This can cause poor performance (hard starting/misfiring) and even shut the engine down from plug fouling.
Also 4 stroke oils seem to want to settle at the bottom of the tank when stored very long. So remixing the fuel may be required before startup.
Bottom line is you can get away using detergent oils (it’s certainly preferable to using NO oil!). But 2 stroke oil is preferred.
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Incidentally over-oiling a 2 stroke (running gas/oil mix beyond recommended) accomplishes nothing except deplete your wallet a bit faster.
It does however result unnecessary exhaust smoke (annoying with chainsaw on a still day!). Also it can cause carbon build-up on the head/exhaust port and plugging of the exhaust spark arrestor. This will reduce performance – especially on lightly loaded engines.
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