Hi, my car Toyota Altis 2003 model 1.6G just underwent top engine overhaul because of oil sludge. Before kasi nagpapachange oil ako every 10k and I am using fully synthetic oil before.

Right now, magpapachange oil ako every 4000 km para maiwasan na po yun oil sludge kasi from what I had heard medyo prone to oil sludge daw mga Altis at Vios. Kahit ordinary motor oil na lang po gamitin para mas mura basta every 4k ang palit.

What oil can you recommend and also for flushing. Balak ko po kasi ako bibili ng oil tapos papachange oil ko na lang sa mga Servitek para mas mura.

I am looking right now at Castrol 20W-50 ok po ba ito? 1 Gallon is P850. If change oil daw, bibili ng 1 gallon at isang maliit.

Please recommend exact model and brand of motor oil and flushing that I can use and please specify amount and saan po makakabili. Im from Manila area. Thanks.