Pag sa labas ako nagpapa-oil change, isang lata/bote ng oil flush yung ginagamit. Mine's a 2.5L, with 6L oil capacity.
Hirap kasi extremes eh. Not enough flush leaves some of the previous oil's sludge in the engine. Too much flush and the fresh oil becomes too thin to protect the engine.
ako i use flush lang kung magpapalit ako ng brand at type ng langis...like kanina, from shell helix diesel to total rubia xt...1 can lang talaga gamit ko...
kaya nagtanong lang.. what if thick na ang oil ng sobra prior to oil change, pwede kayang 2 cans instead of 1 lang para di na buksan ang oil-pan...
It's the small "5 minute" engine flushes that are usually harsh on the engine components... If you're flushing, flushing oils (i.e. Caltex flushing oil) is more adviseable; use around half the equivalent of your engine's capacity. Using a cheap engine oil is also ok...
My 2.8 4m40 Pajero engine used to undergo overnight draining every oil change. At full drain, it needs about 7.5 liters of oil , parang V8 sized engine na yun yet the casa uses just one can of oil flush.
But I guess there's no harm in adding an extra can, especially if you got the extra cash .
Para sa akin hindi na kailangan ang engine flush kung regularly naman ang change oil. Usually ginagamit lang to sa mga repairs na makapal na yung sludge at mahina na ung oil pressure due to restricted oil pump pick-up pipe. Another simple thing is the stuck open thermostat, it can cause the engine not to reach operating temperature promoting oil sludging. Regularly maintain also PCV system and engine breather.