hi tsikoteers,
i changed oil yesterday. For the past 3 consecutive oil changes i have been using castrol magnatech 10w-40 semisynthetic. Before that i was using castrol 20W-50. Switching from 20-50W to 10W-50 semi-synthetic was no problem. But yesterday, i decided to change my oil back to thicker castrol 20W-50. Because the car is old (singkit '91-EFI), thinking that might help reduce the smoke every cold starts. Having changed to thicker oil, immediately the engine starts to behave weird. The engine was shaky, sputters, and idle was very erratic. Parang sakal ang takbo ang I cannot go full throttle without the engine getting wild, sometimes dying. I can only drive 1st to 2nd gear. Seems to me that the engine was severely in a bad timing. But the timing was never adjusted whatsoever during the change oil.
What could have caused this? The thick oil? Perhaps the slight overfill of oil? Please help!!